Table Of Contents
Layer 2 Local Switching
Contents
Prerequisites for Layer 2 Local Switching
Restrictions for Layer 2 Local Switching
Cisco 7200 and 7500 Series Router Restrictions
Cisco 7600 and 6500 Series Router Restrictions
Cisco 10000 Series Router Restrictions
Cisco 12000 Series Router Restrictions
Unsupported Hardware
Information About Layer 2 Local Switching
Layer 2 Local Switching Overview
NSF/SSO—Local Switching Overview
Layer 2 Local Switching Applications
How to Configure Layer 2 Local Switching
Configuring ATM-to-ATM PVC Local Switching and Same-Port Switching
Configuring ATM-to-ATM PVP Local Switching
Configuring ATM PVP Same-Port Switching
Configuring ATM-to-Ethernet Port Mode Local Switching
Configuring ATM-to-Ethernet VLAN Mode Local Switching
Configuring Ethernet VLAN Same-Port Switching
Configuring Ethernet Port Mode to Ethernet VLAN Local Switching
Configuring ATM-to-Frame Relay Local Switching
Configuring Frame Relay-to-Frame Relay Local Switching
Configuring Frame Relay Same-Port Switching
Configuring HDLC Local Switching
Restrictions
Prerequisites
Verifying Layer 2 Local Switching
Verifying Layer 2 Local Switching Configuration
Verifying the NSF/SSO Local Switching Configuration
Troubleshooting Tips
Configuration Examples for Layer 2 Local Switching
ATM-to-ATM Local Switching: Example
ATM PVC Same-Port Switching: Example
ATM PVP Same-Port Switching: Example
ATM-to-Ethernet Local Switching: Examples
ATM to Ethernet VLAN: Example
ATM to Ethernet Port Mode: Example
Ethernet VLAN Same-Port Switching: Example
ATM-to-Frame Relay Local Switching: Example
Frame Relay-to-Frame Relay Local Switching: Example
Frame Relay DLCI Same-Port Switching: Example
HDLC Local Switching: Example
NSF/SSO: Ethernet Port Mode to Ethernet VLAN Local Switching: Example
Additional References
Related Documents
Standards
MIBs
RFCs
Technical Assistance
Command Reference
Feature Information for Layer 2 Local Switching
Layer 2 Local Switching
First Published: December 17, 2003
Last Updated: April 21, 2008
The Layer 2 Local Switching feature allows you to switch Layer 2 data in two ways:
•
Between two interfaces on the same router
•Between two circuits on the same interface port, which is called same-port switching
The interface-to-interface switching combinations supported by this feature are:
•ATM to ATM
•ATM to Ethernet
•ATM to Frame Relay
•Ethernet to Ethernet VLAN
•Frame Relay to Frame Relay (and Multilink Frame Relay in Cisco IOS Release 12.0(28)S and later)
•High-Level Data Link Control (HDLC) HDLC
The following same-port switching features are supported:
•ATM (Permanent Virtual Circuit (PVC) and Permanent Virtual Path (PVP)
•Ethernet VLAN
•Frame Relay
Finding Feature Information in This Module
Your Cisco IOS software release may not support all of the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To reach links to specific feature documentation in this module and to see a list of the releases in which each feature is supported, use the "Feature Information for Layer 2 Local Switching" section.
Finding Support Information for Platforms and Cisco IOS and Catalyst OS Software Images
Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
Contents
•Prerequisites for Layer 2 Local Switching
•Restrictions for Layer 2 Local Switching
•Information About Layer 2 Local Switching
•How to Configure Layer 2 Local Switching
•Configuration Examples for Layer 2 Local Switching
•Additional References
•Command Reference
•Feature Information for Layer 2 Local Switching
Prerequisites for Layer 2 Local Switching
•You must enable Cisco Express Forwarding for the Cisco 7200 series router. You must use Cisco Express Forwarding or Distributed Cisco Express Forwarding for the Cisco 7500 series router. (Distributed Cisco Express Forwarding is enabled already by default on the Cisco 12000 series routers).
•For Frame Relay local switching, you must globally issue the frame-relay switching command.
Restrictions for Layer 2 Local Switching
The following sections list the restrictions for the Layer 2 Local Switching feature:
•Cisco 7200 and 7500 Series Router Restrictions
•Cisco 7600 and 6500 Series Router Restrictions
•Cisco 7600 and 6500 Series Router Restrictions
•Cisco 10000 Series Router Restrictions
•Cisco 12000 Series Router Restrictions
•Unsupported Hardware
Cisco 7200 and 7500 Series Router Restrictions
•In ATM single cell relay AAL0, the ATM virtual path identifier/virtual channel identifier (VPI/VCI) values must match between the ingress and egress ATM interfaces on the Cisco 7200 series and 7500 series routers. If Layer 2 local switching is desired between two ATM VPIs and VCIs whose values do not match and are on two different interfaces, choose ATM AAL5. However, if the ATM AAL5 is using Operation, Administration, and Maintenance (OAM) transparent mode, the VPI and VCI values must match.
•NSF/SSO: Layer 2 Local Switching is supported on Cisco 7500 series routers.
Layer 2 local switching is supported on the following interface processors in the Cisco 7200 series routers:
•C7200-I/O-2FE
•C7200-I/O-GE+E (Only the Gigabit Ethernet port of this port adapter is supported.)
•C7200-I/O-FE
Layer 2 local switching is supported on the following interface processors in the Cisco 7500 series routers:
•GEIP (Gigabit Ethernet interface processor)
•GEIP+ (enhanced Gigabit Ethernet interface processor)
Layer 2 local switching is supported on the following port adapters in the Cisco 7200 and 7500 series routers:
•PA-FE-TX (single-port Fast Ethernet 100BASE-TX)
•PA-FE-FX (single-port Fast Ethernet 100BASE-FX)
•PA-2FE-TX (dual-port Fast Ethernet 100BASE-TX)
•PA-2FE-FX (dual-port Fast Ethernet 100BASE-FX)
•PA-4E (4-port Ethernet adapter)
•PA-8E (8-port Ethernet adapter)
•PA-4T (4-port synchronous serial port adapter)
•PA-4T+ (enhanced 4-port synchronous serial port adapter)
•PA-8T (8-port synchronous serial port adapter)
•PA-12E/2FE (12-port Ethernet/2-port Fast Ethernet (FE) adapter) [Cisco 7200 only]
•PA-GE (Gigabit Ethernet port adapter) [Cisco 7200 only]
•PA-H (single-port High-Speed Serial Interface (HSSI) adapter)
•PA-2H (dual-port HSSI adapter)
•PA-MC-8E1 (8-port multichannel E1 G.703/G.704 120-ohm interfaces)
•PA-MC-2EI (2-port multichannel E1 G.703/G.704 120-ohm interfaces)
•PA-MC-8T1 (8-port multichannel T1 with integrated data service units (DSUs) and channel service units CSUs))
•PA-MC-4T1 (4-port multichannel T1 with integrated CSUs and DSUs)
•PA-MC-2T1 (2-port multichannel T1 with integrated CSUs and DSUs)
•PA-MC-8TE1+ (8-port multichannel T1/E1)
•PA-MC-T3 (1-port multichannel T3 interface)
•PA-MC-E3 (1-port multichannel E3 interface)
•PA-MC-2T3+ (2-port enhanced multichannel T3 port adapter)
•PA-MC-STM1 (1-port multichannel STM-1 port adapter) [Cisco 7500 only]
•PA-T3 (single-port T3 port adapter)
•PA-E3 (single-port E3 port adapter)
•PA-2E3 (2-port E3 port adapter)
•PA-2T3 (2-port T3 port adapter)
•PA-POS-OC-3SML (single-port Packet over SONET (POS), single-mode, long reach)
•PA-POS-OC-3SMI (single-port PoS, single-mode, intermediate reach)
•PA-POS-OC-3MM (single-port PoS, multimode)
•PA-A3-OC-3 (1-port ATM OC-3/STM1 port adapter, enhanced)
•PA-A3-OC-12 (1-port ATM OC-12/STM-4 port adapter, enhanced) [Cisco 7500 only]
•PA-A3-T3 (DS3 high-speed interface)
•PA-A3-E3 (E3 medium-speed interface)
•PA-A3-8T1IMA (ATM inverse multiplexer over ATM port adapter with 8 T1 ports)
•PA-A3-8E1IMA (ATM inverse multiplexer over ATM port adapter with 8 E1 ports)
•PA-A6 (Cisco ATM Port Adapter)
Cisco 7600 and 6500 Series Router Restrictions
•Layer 2 Local Switching supports the following port adapters and interface processors on the Cisco 7600-SUP720/MSFC3 router:
–All port adapters on the Enhanced FlexWAN module
–All SPAs on the SIP-200 line cards
•On the Cisco 6500 series and 7600 series routers, only like-to-like local switching is supported (ATM to ATM and Frame Relay to Frame Relay).
•Same-port switching is not supported on the Cisco 6500 series and 7600 series routers.
Cisco 10000 Series Router Restrictions
For information about Layer 2 Local Switching on the Cisco 10000 series routers, see the "Configuring Layer 2 Local Switching " section of the Cisco 10000 Series Router Broadband Aggregation, Leased-Line, and MPLS Configuration Guide.
Cisco 12000 Series Router Restrictions
•VPI/VCI rewrite is supported on the Cisco 12000 series routers.
•All Cisco 12000 series line cards support Frame Relay-to-Frame Relay local switching.
•8-port OC-3 ATM Engine 2 line cards support only like-to-like Layer 2 local switching.
•ISE (Engine 3) line cards support like-to-like and any-to-any local switching. Non-ISE line cards support only like-to-like local switching.
Starting in Cisco IOS Release 12.0(31)S2, ISE customer edge-facing interfaces support the following types of like-to-like and any-to-any local switching:
–ATM to ATM
–ATM to Ethernet
–ATM to Frame Relay
–Ethernet to Ethernet VLAN
–Frame Relay to Frame Relay (including Multilink Frame Relay)
–Same-port switching for ATM (PVC and PVP)
–Same-port switching for Ethernet VLAN
–Same-port switching for Frame Relay
Note Native Layer 2 Tunnel Protocol Version 3 (L2TPv3) tunnel sessions on customer edge-facing line cards can coexist with tunnel sessions that use a tunnel-server card.
•Starting in Cisco IOS Release 12.0(32)SY, customer edge-facing interfaces on Engine 5 shared port adapters (SPAs) and SPA Interface Processors (SIPs) support the following types of like-to-like local switching:
–Ethernet to Ethernet VLAN
–Frame Relay to Frame Relay (including Multilink Frame Relay)
–Same-port switching for Ethernet VLAN
–Same-port switching for Frame Relay
•For ATM-to-ATM local switching, the following ATM types are supported for the Layer 2 Local Switching feature:
–ATM adaptation layer 5 (AAL5)
–ATM single cell relay adaptation layer 0 (AAL0), VC mode
–ATM single cell relay VP mode on the Cisco 12000 series router
–ATM single cell relay VC and VP modes on ISE line cards on the Cisco 12000 series router
•Starting with Cisco IOS Release 12.0(30)S, you can use Local Switching and cell packing with ATM VP or VC mode on the Cisco 12000 series router on IP Services Engine (ISE/Engine 3) line cards. For information about how to configure cell packing, refer to Any Transport over MPLS.
Unsupported Hardware
The following hardware is not supported:
•Cisco 7200—non-VXR chassis
•Cisco 7500—Route Switch Processor (RSP)1 and 2
•Cisco 7500—Versatile Interface Processor (VIP) 2-40 and below
•Cisco 12000 series—4-port OC-3 ATM Engine-0 line card
•Cisco 12000 series—4-port OC-12 ATM Engine-2 line card
•Cisco 12000 series—1-port OC-12 ATM Engine-0 line card
•Cisco 12000 series—Ethernet Engine-1, Engine-2, and Engine-4 line cards
Information About Layer 2 Local Switching
To configure the the Layer 2 Local Switching feature, you should understand the following
concepts:
•Layer 2 Local Switching Overview
•NSF/SSO—Local Switching Overview
•Layer 2 Local Switching Applications
For information about Layer 2 Local Switching on the Cisco 10000 series routers, see the "Configuring Layer 2 Local Switching " section of the Cisco 10000 Series Router Broadband Aggregation, Leased-Line, and MPLS Configuration Guide.
Layer 2 Local Switching Overview
Local switching allows you to switch Layer 2 data between two interfaces of the same type (for example, ATM to ATM, or Frame Relay to Frame Relay) or between interfaces of different types (for example, Frame Relay to ATM) on the same router. The interfaces can be on the same line card or on two different cards. During these kinds of switching, the Layer 2 address is used, not any Layer 3 address.
Additionally, same-port local switching allows you to switch Layer 2 data between two circuits on the same interface.
NSF/SSO—Local Switching Overview
Nonstop forwarding (NSF) and stateful switchover (SSO) improve the availability of the network by providing redundant route processors and checkpointing of data to ensure minimal packet loss when the primary route processor goes down. NSF/SSO support is available for the following locally switched attachment circuits:
•Ethernet to Ethernet VLAN
•Frame Relay to Frame Relay
Layer 2 Local Switching Applications
Incumbent local exchange carriers (ILECs) who use an interexchange carrier (IXC) to carry traffic between two local exchange carriers can use the Layer 2 Local Switching feature. Telecom regulations require the ILECs to pay the IXCs to carry that traffic. At times, the ILECs cannot terminate customer connections that are in different local access and transport areas (LATAs). In other cases, customer connections terminate in the same LATA, which may also be on the same router.
For example, company A has more than 50 LATAs across the country and uses three routers for each LATA. Company A uses companies B and C to carry traffic between local exchange carriers. Local switching of Layer 2 frames on the same router might be required.
Similarly, if a router is using, for example, a channelized interface, it might need to switch incoming and outgoing traffic across two logical interfaces that reside on a single physical port. The same-port local switching feature addresses that implementation.
Figure 1 shows a network that uses local switching for both Frame Relay to Frame Relay and ATM to Frame Relay local switching.
Figure 1 Local Switching Example
How to Configure Layer 2 Local Switching
The following sections explain the how to configure the each type of Layer 2 Local Switching:
•Configuring ATM-to-ATM PVC Local Switching and Same-Port Switching (optional)
•Configuring ATM-to-ATM PVP Local Switching (optional)
•Configuring ATM PVP Same-Port Switching (optional)
•Configuring ATM-to-Ethernet Port Mode Local Switching (optional)
•Configuring ATM-to-Ethernet VLAN Mode Local Switching (optional)
•Configuring Ethernet VLAN Same-Port Switching (optional)
•Configuring Ethernet Port Mode to Ethernet VLAN Local Switching (optional)
•Configuring ATM-to-Frame Relay Local Switching (optional)
•Configuring Frame Relay-to-Frame Relay Local Switching (optional)
•Configuring Frame Relay Same-Port Switching (optional)
•Configuring HDLC Local Switching (optional)
•Verifying Layer 2 Local Switching (optional)
For information about Layer 2 Local Switching on the Cisco 10000 series routers, see the "Configuring Layer 2 Local Switching " section of the Cisco 10000 Series Router Broadband Aggregation, Leased-Line, and MPLS Configuration Guide.
Configuring ATM-to-ATM PVC Local Switching and Same-Port Switching
You can configure local switching for both ATM AAL5 and ATM AAL0 encapsulation types.
Creating the ATM PVC is not required. If you do not create a PVC, one is created for you. For ATM-to-ATM local switching, the autoprovisioned PVC is given the default encapsulation type AAL0 cell relay.
Note Starting with Cisco IOS Release 12.0(30)S, you can configure same-port switching following the steps in this section.
Use the following steps to configure ATM-to-ATM PVC local switching and same-port switching.
SUMMARY STEPS
1. enable
2. configure terminal
3. interface atmslot/port
4. pvc vpi/vci l2transport
5. encapsulation layer-type
6. exit
7. exit
8. connect connection-name interface pvc interface pvc
DETAILED STEPS
| |
Command or Action
|
Purpose
|
Step 1
|
enable
Example:
Router> enable
|
Enables privileged EXEC mode.
•Enter your password if prompted.
|
Step 2
|
configure terminal
Example:
Router# configure terminal
|
Enters global configuration mode.
|
Step 3
|
interface atmslot/port
Example:
Router(config)# interface atm1/0
|
Specifies an ATM line card, subslot (if available), and port, and enters interface configuration mode.
|
Step 4
|
pvc vpi/vci l2transport
Example:
Router(config-if)# pvc 1/200 l2transport
|
Assigns a VPI and VCI and enters ATM PVC l2transport configuration mode.
•The l2transport keyword indicates that the PVC is a switched PVC instead of a terminated PVC.
|
Step 5
|
encapsulation layer-type
Example:
Router(cfg-if-atm-l2trans-pvc)# encapsulation
aal5
|
Specifies the encapsulation type for the ATM PVC. Both AAL0 and AAL5 are supported.
•Repeat Steps 3 through 5 for another ATM PVC on the same router.
|
Step 6
|
exit
Example:
Router(cfg-if-atm-l2trans-pvc)# exit
|
Exits PVC l2transport configuration mode and returns to interface configuration mode.
|
Step 7
|
exit
Example:
Router(config-if)# exit
|
Exits interface configuration mode and returns to global configuration mode.
|
Step 8
|
connect connection-name interface pvc interface
pvc
Example:
Router(config)# connect atm-con atm1/0/0 0/100
atm2/0/0 0/100
|
Creates a local connection between the two specified permanent virtual circuits.
|
Configuring ATM-to-ATM PVP Local Switching
Use the following steps to configure ATM-to-ATM PVP local switching.
Starting with Cisco IOS Release 12.0(30)S, you can configure same-port switching, as detailed in the "Configuring ATM PVP Same-Port Switching" section.
SUMMARY STEPS
1. enable
2. configure terminal
3. interface atmslot/port
4. atm pvp vpi l2transport
5. exit
6. exit
7. connect connection-name interface pvp interface pvp
DETAILED STEPS
| |
Command or Action
|
Purpose
|
Step 1
|
enable
Example:
Router> enable
|
Enables privileged EXEC mode.
•Enter your password if prompted.
|
Step 2
|
configure terminal
Example:
Router# configure terminal
|
Enters global configuration mode.
|
Step 3
|
interface atmslot/port
Example:
Router(config)# interface atm1/0
|
Specifies an ATM line card, subslot (if available), and port, and enters interface configuration mode.
|
Step 4
|
atm pvp vpi l2transport
Example:
Router(config-if)# atm pvp 100 l2transport
|
Identifies the virtual path and enters PVP l2transport configuration mode. The l2transport keyword indicates that the PVP is a switched PVP instead of a terminated PVP.
•Repeat Steps 3 and 4 for another ATM permanent virtual path on the same router.
|
Step 5
|
exit
Example:
Router(config-if-atm-l2trans-pvp)# exit
|
Exits PVP l2transport configuration mode and returns to interface configuration mode.
|
Step 6
|
exit
Example:
Router(config-if)# exit
|
Exits interface configuration mode and returns to global configuration mode.
|
Step 7
|
connect connection-name interface pvp interface
pvp
Example:
Router(config)# connect atm-con
atm1/0 100 atm2/0 200
|
In global configuration mode, creates a local connection between the two specified permanent virtual paths.
|
Configuring ATM PVP Same-Port Switching
Use the following steps to configure ATM PVP switching on an ATM interface.
SUMMARY STEPS
1. enable
2. configure terminal
3. interface atmslot/subslot/port
4. atm pvp vpi l2transport
5. exit
6. exit
7. connect connection-name interface pvp interface pvp
DETAILED STEPS
| |
Command or Action
|
Purpose
|
Step 1
|
enable
Example:
Router> enable
|
Enables privileged EXEC mode.
•Enter your password if prompted.
|
Step 2
|
configure terminal
Example:
Router# configure terminal
|
Enters global configuration mode.
|
Step 3
|
interface atmslot/subslot/port
Example:
Router(config)# interface atm1/0/0
|
Specifies an ATM line card, subslot (if available), and port, and enters interface configuration mode.
|
Step 4
|
atm pvp vpi l2transport
Example:
Router(config-if)# atm pvp 100 l2transport
|
Specifies one VPI and enters PVP l2transport configuration mode. Repeat this step for the other ATM permanent virtual path on this same port.
•The l2transport keyword indicates that the indicated PVP is a switched PVP instead of a terminated PVP.
|
Step 5
|
exit
Example:
Router(config-if-atm-l2trans-pvp)# exit
|
Exits PVP l2transport configuration mode and returns to interface configuration mode.
|
Step 6
|
exit
Example:
Router(config-if)# exit
|
Exits interface configuration mode and returns to global configuration mode.
|
Step 7
|
connect connection-name interface pvp interface
pvp
Example:
Router(config)# connect atm-con atm1/0/0 100
atm1/0/0 200
|
In global configuration mode, creates the local connection between the two specified permanent virtual paths.
|
Configuring ATM-to-Ethernet Port Mode Local Switching
For ATM to Ethernet port mode local switching, creating the ATM PVC is not required. If you do not create a PVC, one is created for you. For ATM-to-Ethernet local switching, the autoprovisioned PVC is given the default encapsulation type AAL5SNAP.
ATM-to-Ethernet local switching supports both the IP and Ethernet interworking types. When the Ethernet interworking type is used, the interworking device (router) expects a bridged packet. Therefore, configure the ATM CPE for either IRB or RBE.
Note Enabling ICMP Router Discovery Protocol on the Ethernet side is recommended.
ATM-to-Ethernet local switching supports the following encapsulation types:
•ATM-to-Ethernet with IP interworking: AAL5SNAP, AAL5MUX
•ATM-to-Ethernet with Ethernet interworking: AAL5SNAP
Use the following steps to configure local switching between ATM and Ethernet port mode.
SUMMARY STEPS
1. enable
2. configure terminal
3. interface atmslot/port
4. pvc vpi/vci l2transport
5. encapsulation layer-type
6. exit
7. exit
8. interface fastethernetslot/subslot/port
9. exit
10. connect connection-name interface pvc interface interworking ip | ethernet
DETAILED STEPS
| |
Command or Action
|
Purpose
|
Step 1
|
enable
Example:
Router> enable
|
Enables privileged EXEC mode.
•Enter your password if prompted.
|
Step 2
|
configure terminal
Example:
Router# configure terminal
|
Enters global configuration mode.
|
Step 3
|
interface atmslot/port
Example:
Router(config)# interface atm1/0
|
Specifies an ATM line card, subslot (if available), and port, and enters interface configuration mode.
|
Step 4
|
pvc vpi/vci l2transport
Example:
Router(config-if)# pvc 1/200 l2transport
|
Assigns a VPI and VCI and enters PVC l2transport configuration mode.
•The l2transport keyword indicates that the PVC is a switched PVC instead of a terminated PVC.
|
Step 5
|
encapsulation layer-type
Example:
Router(cfg-if-atm-l2trans-pvc)# encapsulation
aal5snap
|
Specifies the encapsulation type for the PVC.
|
Step 6
|
exit
Example:
Router(config-if-atm-l2trans-pvc)# exit
|
Exits PVC l2transport configuration mode and returns to interface configuration mode.
|
Step 7
|
exit
Example:
Router(config-if)# exit
|
Exits interface configuration mode and returns to global configuration mode.
|
Step 8
|
interface fastethernetslot/subslot/port
Example:
Router(config)# interface fastethernet6/0/0
|
Specifies a Fast Ethernet line card, subslot (if available), and port, and enters interface configuration mode.
|
Step 9
|
exit
Example:
Router(config-if)# exit
|
Exits interface configuration mode and returns to global configuration mode.
|
Step 10
|
connect connection-name interface pvc interface
interworking ip | ethernet
Example:
Router(config)# connect atm-eth-con atm1/0
0/100 fastethernet6/0/0 interworking ethernet
|
In global configuration mode, creates a local connection between the two interfaces and specifies the interworking type.
•Both the IP and Ethernet interworking types are supported.
|
Configuring ATM-to-Ethernet VLAN Mode Local Switching
For ATM-to-Ethernet VLAN mode local switching, creating the ATM PVC is not required. If you do not create a PVC, one is created for you. For ATM-to-Ethernet local switching, the autoprovisioned PVC is given the default encapsulation type AAL5SNAP.
ATM-to-Ethernet local switching supports both the IP and Ethernet interworking types. When the Ethernet interworking type is used, the interworking device (router) expects a bridged packet. Therefore, configure the ATM CPE for either IRB or RBE.
Note Enabling ICMP Router Discovery Protocol on the Ethernet side is recommended.
ATM-to-Ethernet local switching supports the following encapsulation types:
•ATM-to-Ethernet with IP interworking: AAL5SNAP, AAL5MUX
•ATM-to-Ethernet with Ethernet interworking: AAL5SNAP
The VLAN header is removed from frames that are received on an Ethernet subinterface.
Use the following steps to configure local switching for ATM to Ethernet in VLAN mode.
SUMMARY STEPS
1. enable
2. configure terminal
3. interface atmslot/subslot/port
4. pvc vpi/vci l2transport
5. encapsulation layer-type
6. exit
7. interface fastethernetslot/port/subinterface-number
8. encapsulation dot1q vlan-id
9. exit
10. connect connection-name interface pvc interface interworking ip | ethernet
DETAILED STEPS
| |
Command or Action
|
Purpose
|
Step 1
|
enable
Example:
Router> enable
|
Enables privileged EXEC mode.
•Enter your password if prompted.
|
Step 2
|
configure terminal
Example:
Router# configure terminal
|
Enters global configuration mode.
|
Step 3
|
interface atmslot/subslot/port
Example:
Router(config)# interface atm1/0/0
|
Specifies an ATM line card, subslot (if available), and port, and enters interface configuration mode.
|
Step 4
|
pvc vpi/vci l2transport
Example:
Router(config-if)# pvc 1/200 l2transport
|
Assigns a VPI and VCI and enters PVC l2transport configuration mode.
•The l2transport keyword indicates that the PVC is a switched PVC instead of a terminated PVC.
|
Step 5
|
encapsulation layer-type
Example:
Router(cfg-if-atm-l2trans-pvc)# encapsulation
aal5snap
|
Specifies the encapsulation type for the PVC.
|
Step 6
|
exit
Example:
Router(cfg-if-atm-l2trans-pvc)# exit
|
Exits PVC l2transport configuration mode and returns to interface configuration mode.
|
Step 7
|
interface
fastethernetslot/port/subinterface-number
Example:
Router(config-if)# interface
fastethernet6/0/0.1
|
Specifies a Fast Ethernet line card, subslot (if available), port, and subinterface, and enters subinterface configuration mode.
|
Step 8
|
encapsulation dot1q vlan-id
Example:
Router(config-subif)# encapsulation dot1q 100
|
Enables the interface to accept 802.1Q VLAN packets.
|
Step 9
|
exit
Example:
Router(config-subif)# exit
|
Exits subinterface configuration mode and returns to global configuration mode.
|
Step 10
|
connect connection-name interface pvc interface
interworking ip | ethernet
Example:
Router(config)# connect atm-eth-vlan-con
atm1/0/0 0/100 fastethernet6/0/0.1 interworking
ethernet
|
In global configuration mode, creates a local connection between the two interfaces and specifies the interworking type.
•Both the IP and Ethernet interworking types are supported.
|
Configuring Ethernet VLAN Same-Port Switching
Use the following steps to configure Ethernet VLAN same-port switching.
SUMMARY STEPS
1. enable
2. configure terminal
3. interface fastethernetslot/port.subinterface-number
4. encapsulation dot1q vlan-id
5. exit
6. interface fastethernetslot/port.subinterface-number
7. encapsulation dot1q vlan-id
8. exit
9. connect connection-name interface interface
DETAILED STEPS
| |
Command or Action
|
Purpose
|
Step 1
|
enable
Example:
Router> enable
|
Enables privileged EXEC mode.
•Enter your password if prompted.
|
Step 2
|
configure terminal
Example:
Router# configure terminal
|
Enters global configuration mode.
|
Step 3
|
interface
fastethernetslot/port.subinterface-number
Example:
Router(config)# interface fastethernet6/0.1
|
Specifies the first Fast Ethernet line card, subslot (if available), port, and subinterface, and enters subinterface configuration mode.
|
Step 4
|
encapsulation dot1q vlan-id
Example:
Router(config-subif)# encapsulation dot1q 10
|
Enables that subinterface to accept 802.1Q VLAN packets and specifies the first VLAN.
|
Step 5
|
exit
Example:
Router(config-subif)# exit
|
Exits subinterface configuration mode and returns to global configuration mode.
|
Step 6
|
interface
fastethernetslot/port.subinterface-number
Example:
Router(config)# interface fastethernet6/0.2
|
In global configuration mode, specifies the second Fast Ethernet line card, subslot (if available), port, and subinterface, and enters subinterface configuration mode.
|
Step 7
|
encapsulation dot1q vlan-id
Example:
Router(config-subif)# encapsulation dot1q 20
|
Enables this subinterface to accept 802.1Q VLAN packets and specifies the second VLAN.
|
Step 8
|
exit
Example:
Router(config-subif)# exit
|
Exits subinterface configuration mode and returns to global configuration mode.
|
Step 9
|
connect connection-name interface interface
Example:
Router(config)# connect conn fastethernet6/0.1
fastethernet6/0.2
|
In global configuration mode, creates a local connection between the two subinterfaces (and hence their previously specified VLANs) on the same Fast Ethernet port.
|
Configuring Ethernet Port Mode to Ethernet VLAN Local Switching
This section explains how to configure local switching for Ethernet (port mode) to Ethernet VLAN.
SUMMARY STEPS
1. enable
2. configure terminal
3. interface fastethernetslot/subslot/port
4. interface fastethernetslot/port/subinterface-number
5. encapsulation dot1q vlan-id
6. exit
7. connect connection-name interface interface [interworking ip | ethernet]
DETAILED STEPS
| |
Command or Action
|
Purpose
|
Step 1
|
enable
Example:
Router> enable
|
Enables privileged EXEC mode.
•Enter your password if prompted.
|
Step 2
|
configure terminal
Example:
Router# configure terminal
|
Enters global configuration mode.
|
Step 3
|
interface fastethernetslot/subslot/port
Example:
Router(config)# interface fastethernet3/0/0
|
Specifies a Fast Ethernet line card, subslot (if available), and port, and enters interface configuration mode. This is the interface on one side of the PE router that passes Ethernet packets to and from the customer edge (CE) router.
|
Step 4
|
interface
fastethernetslot/port/subinterface-number
Example:
Router(config)# interface fastethernet6/0/0.1
|
Specifies a Fast Ethernet line card, subslot (if available), port, and subinterface, and enters subinterface configuration mode. This is the interface on the other side of the PE router than passes Ethernet VLAN packets to and from the CE router.
|
Step 5
|
encapsulation dot1q vlan-id
Example:
Router(config-subif)# encapsulation dot1q 100
|
Enables the interface to accept 802.1Q VLAN packets.
|
Step 6
|
exit
Example:
Router(config-subif)# exit
|
Exits subinterface configuration mode and returns to global configuration mode.
|
Step 7
|
connect connection-name interface interface
[interworking ip | ethernet]
Example:
Router(config)# connect eth-ethvlan-con
fastethernet3/0/0 fastethernet6/0/0.1
interworking ethernet
|
Creates a local connection between the two interfaces and specifies the interworking type.
•Both the IP and Ethernet interworking types are supported.
|
Configuring ATM-to-Frame Relay Local Switching
You use the interworking ip keywords for configuring ATM-to-Frame Relay local switching.
FRF.8 Frame Relay-to-ATM service interworking functionality is not supported. Frame Relay discard-eligible (DE) bits do not get mapped to ATM cell loss priority (CLP) bits, and forward explicit congestion notification (FECN) bits do not get mapped to ATM explicit forward congestion indication (EFCI) bits.
For additional information about ATM-to-Frame Relay Local Switching, see the "Configuring Frame Relay-ATM Interworking" section of the Cisco IOS Wide Area Networking Configuration Guide.
Creating the PVC is not required. If you do not create a PVC, one is created for you. For ATM-to-Ethernet local switching, the automatically provisioned PVC is given the default encapsulation type AAL5SNAP.
ATM-to-Frame Relay local switching supports the following encapsulation types:
•AAL5SNAP
•AAL5NLPID (Cisco 12000 series router uses AAL5MUX instead, for IP interworking)
SUMMARY STEPS
1. enable
2. configure terminal
3. interface atmslot/port
4. pvc vpi/vci l2transport
5. encapsulation layer-type
6. exit
7. interface serialslot/port
8. encapsulation frame-relay [cisco | ietf]
9. frame-relay interface-dlci dlci switched
10. exit
11. connect connection-name interface pvc interface dlci [interworking ip | ethernet]
DETAILED STEPS
| |
Command or Action
|
Purpose
|
Step 1
|
enable
Example:
Router> enable
|
Enables privileged EXEC mode.
•Enter your password if prompted.
|
Step 2
|
configure terminal
Example:
Router# configure terminal
|
Enters global configuration mode.
|
Step 3
|
interface atmslot/port
Example:
Router(config)# interface atm1/0
|
Specifies an ATM line card, subslot (if available), and port, and enters interface configuration mode.
|
Step 4
|
pvc vpi/vci l2transport
Example:
Router(config-if)# pvc 1/200 l2transport
|
Assigns a VPI and VCI and enters PVC l2transport configuration mode.
•The l2transport keyword indicates that the PVC is a switched PVC instead of a terminated PVC.
|
Step 5
|
encapsulation layer-type
Example:
Router(cfg-if-atm-l2trans-pvc)# encapsulation
aal5snap
|
Specifies the encapsulation type for the PVC.
|
Step 6
|
exit
Example:
Router(cfg-if-atm-l2trans-pvc)# exit
|
Exits PVC l2transport configuration mode and returns to interface configuration mode.
|
Step 7
|
interface serialslot/subslot/port
Example:
Router(config-if)# interface serial6/0/0
|
Specifies a channelized line card, subslot (if available), and serial port.
|
Step 8
|
encapsulation frame-relay [cisco | ietf]
Example:
Router(config-if)# encapsulation frame-relay
ietf
|
Specifies Frame Relay encapsulation for the interface.
•The encapsulation type does not matter for local switching. It has relevance only for terminated circuits.
|
Step 9
|
frame-relay interface-dlci dlci switched
Example:
Router(config-if)# frame-relay interface-dlci
100 switched
|
(Optional) Configures a switched Frame Relay DLCI.
•If you do not create a Frame Relay PVC in this step, one is automatically created by the connect command.
|
Step 10
|
exit
Example:
Router(config-if)# exit
|
Exits interface configuration mode and returns to global configuration mode.
|
Step 11
|
connect connection-name interface pvc interface
dlci [interworking ip | ethernet]
Example:
Router(config)# connect atm-fr-con
atm1/0 0/100 serial6/0/0 100 interworking ip
|
Creates a local connection between the two interfaces.
|
Configuring Frame Relay-to-Frame Relay Local Switching
For background information about Frame Relay-to-Frame Relay Local Switching, see the Distributed Frame Relay Switching feature module.
With Cisco IOS Release 12.0(30)S, you can switch between virtual circuits on the same port, as detailed in the "Configuring Frame Relay Same-Port Switching" section.
SUMMARY STEPS
1. enable
2. configure terminal
3. ip cef [distributed]
4. frame-relay switching
5. interface type number
6. encapsulation frame-relay [cisco | ietf]
7. frame-relay interface-dlci dlci switched
8. exit
9. exit
10. connect connection-name interface dlci interface dlci
DETAILED STEPS
| |
Command or Action
|
Purpose
|
Step 1
|
enable
Example:
Router> enable
|
Enables privileged EXEC mode.
•Enter your password if prompted.
|
Step 2
|
configure terminal
Example:
Router# configure terminal
|
Enters global configuration mode.
|
Step 3
|
ip cef [distributed]
Example:
Router(config)# ip cef
|
Enables Cisco Express Forwarding operation.
•For the Cisco 7500 series router, use the ip cef distributed command. (On the Cisco 12000 series router, this command is already enabled by default).
•For the Cisco 7200 series router, use the ip cef command.
|
Step 4
|
frame-relay switching
Example:
Router(config)# frame-relay switching
|
Enables PVC switching on a Frame Relay DCE device or a Network-to-Network Interface (NNI).
|
Step 5
|
interface type number
Example:
Router(config)# interface serial 0
|
Specifies a Frame Relay interface and enters interface configuration mode.
|
Step 6
|
encapsulation frame-relay [cisco | ietf]
Example:
Router(config-if)# encapsulation frame-relay
|
Enables Frame Relay encapsulation.
•The default is cisco encapsulation.
•You do not need to specify an encapsulation type.
|
Step 7
|
frame-relay interface-dlci dlci switched
Example:
Router(config-if)# frame-relay interface-dlci
100 switched
|
(Optional) Creates a switched PVC and enters Frame Relay DLCI configuration mode.
•Repeat steps 5 through 7 for each switched PVC.
•If you do not create a Frame Relay PVC in this step, it will automatically be created by the connect command.
|
Step 8
|
exit
Example:
Router(config-fr-dlci)# exit
|
Exits Frame Relay DLCI configuration mode and returns to interface configuration mode.
|
Step 9
|
exit
Example:
Router(config-if)# exit
|
Exits interface configuration mode and returns to global configuration mode.
|
Step 10
|
connect connection-name interface dlci
interface dlci
Example:
Router(config)# connect connection1 serial0 100
serial1 101
|
Defines a connection between Frame Relay PVCs.
|
Configuring Frame Relay Same-Port Switching
Use the following steps to configure Frame Relay switching on the same interface.
SUMMARY STEPS
1. enable
2. configure terminal
3. ip cef [distributed]
4. frame-relay switching
5. interface type number
6. encapsulation frame-relay [cisco | ietf]
7. frame-relay intf-type [dte | dce | nni]
8. frame-relay interface-dlci dlci switched
9. exit
10. exit
11. connect connection-name interface dlci interface dlci
DETAILED STEPS
| |
Command or Action
|
Purpose
|
Step 1
|
enable
Example:
Router> enable
|
Enables privileged EXEC mode.
•Enter your password if prompted.
|
Step 2
|
configure terminal
Example:
Router# configure terminal
|
Enters global configuration mode.
|
Step 3
|
ip cef [distributed]
Example:
Router(config)# ip cef
|
Enables Cisco Express Forwarding operation.
•For the Cisco 7500 series router, use the ip cef distributed command. (On the Cisco 12000 series router, this command is already enabled by default).
•For the Cisco 7200 series router, use the ip cef command.
|
Step 4
|
frame-relay switching
Example:
Router(config)# frame-relay switching
|
Enables PVC switching on a Frame Relay DCE device or a NNI.
|
Step 5
|
interface type number
Example:
Router(config)# interface serial 0
|
Specifies a Frame Relay interface and enters interface configuration mode.
|
Step 6
|
encapsulation frame-relay [cisco | ietf]
Example:
Router(config-if)# encapsulation frame-relay
|
Enables Frame Relay encapsulation.
•The default is cisco encapsulation.
•You do not need to specify an encapsulation type.
|
Step 7
|
frame-relay intf-type [dce | dte | nni]
Example:
Router(config-if)# frame-relay intf-type nni
|
(Optional) Enables support for a particular type of connection:
•DCE
•DTE (default)
•NNI
|
Step 8
|
frame-relay interface-dlci dlci switched
Example:
Router(config-if)# frame-relay interface-dlci
100 switched
|
(Optional) Creates a switched PVC and enters Frame Relay DLCI configuration mode.
•If you do not create a Frame Relay PVC in this step, it will automatically be created by the connect command.
|
Step 9
|
exit
Example:
Router(config-fr-dlci)# exit
|
Exits Frame Relay DLCI configuration mode and returns to interface configuration mode.
|
Step 10
|
exit
Example:
Router(config-if)# exit
|
Exits interface configuration mode and returns to global configuration mode.
|
Step 11
|
connect connection-name interface dlci
interface dlci
Example:
Router(config)# connect connection1 serial1/0
100 serial1/0 200
|
Defines a connection between the two data links.
|
Configuring HDLC Local Switching
This section explains how to configure local switching for HDLC. The PE routers are configured with HDLC encapsulation. The CE routers are configured with any HDLC-based encapsulation, including HDLC, PPP, and Frame Relay.
Restrictions
•Do not configure other settings on the interfaces configured for HDLC encapsulation. If you assign an IP address on the interface, the connect command is rejected and the following error message displays:
Incompatible with IP address command on interface - command rejected.
If you configure other settings on the interface that is enabled for HDLC encapsulation, the local switching feature may not work.
•Interworking is not supported.
•Same-port local switching for HDLC is not supported.
•Dialer and ISDN inerfaces are not supported. Only serial, HSSI, and POS interfaces can be configured for HDLC local switching.
Prerequisites
•Ensure that the interfaces you configure for HDLC encapsulation can handle ping packets that are smaller, the same size as, or larger than the CE interface MTU.
•Enable Cisco Express Forwarding.
SUMMARY STEPS
1. enable
2. configure terminal
3. ip cef [distributed]
4. interface type number
5. exit
6. connect connection-name interface interface
DETAILED STEPS
| |
Command or Action
|
Purpose
|
Step 1
|
enable
Example:
Router> enable
|
Enables privileged EXEC mode.
•Enter your password if prompted.
|
Step 2
|
configure terminal
Example:
Router# configure terminal
|
Enters global configuration mode.
|
Step 3
|
ip cef
Example:
Router(config)# ip cef
|
Enables Cisco Express Forwarding operation.
|
Step 4
|
interface type number
Example:
Router(config)# interface serial 2/0
|
Specifies an interface and enters interface configuration mode.
|
Step 5
|
exit
Example:
Router(config-if)# exit
|
Exits interface configuration mode and returns to global configuration mode.
|
Step 6
|
connect connection-name interface interface
Example:
Router(config)# connect connection1 serial1/0
serial1/0
|
Defines a connection between the two interfaces.
|
Verifying Layer 2 Local Switching
This section provides the following verification tasks and troubleshooting information:
•Verifying Layer 2 Local Switching Configuration
•Verifying the NSF/SSO Local Switching Configuration
•Troubleshooting Tips
Verifying Layer 2 Local Switching Configuration
To verify configuration of the Layer 2 Local Switching feature, use the following commands on the provider edge (PE) router:
SUMMARY STEPS
1. show connection [all | element | id ID | name name | port port]
2. show atm pvc
3. show frame-relay pvc [pvc]
DETAILED STEPS
Step 1 show connection [all | element | id ID | name name | port port]
The show connection command displays the local connection between an ATM interface and a Fast Ethernet interface:
Router# show connection name atm-eth-con
ID Name Segment 1 Segment 2 State
==================================================================
1 atm-eth-con ATM0/0/0 AAL5 0/100 FastEthernet6/0/0 UP
This example displays the local connection between an ATM interface and a serial interface:
Router# show connection name atm-fr-con
ID Name Segment 1 Segment 2 State
==================================================================
1 atm-fr-con ATM0/0/0 AAL5 0/100 Serial1/0/0 16 UP
This example displays a same-port connection on a serial interface.
Router# show connection name same-port
ID Name Segment 1 Segment 2 State
==================================================================
1 same-port Serial1/1/1 101 Serial1/1/1 102 UP
Step 2 show atm pvc
The show atm pvc command shows that interface ATM3/0 is UP:
Interface Name VPI VCI Type Encaps SC Kbps Kbps Cells Sts
3/0 10 1 32 PVC FRATMSRV UBR 155000 UP
Step 3 show frame-relay pvc [pvc]
The show frame-relay pvc command shows a switched Frame Relay PVC:
Router# show frame-relay pvc 16
PVC Statistics for interface POS5/0 (Frame Relay NNI)
DLCI = 16, DLCI USAGE = SWITCHED, PVC STATUS = UP, INTERFACE = POS5/0
LOCAL PVC STATUS = UP, NNI PVC STATUS = ACTIVE
input pkts 0 output pkts 0 in bytes 0
out bytes 0 dropped pkts 100 in FECN pkts 0
in BECN pkts 0 out FECN pkts 0 out BECN pkts 0
in DE pkts 0 out DE pkts 0
out bcast pkts 0 out bcast bytes 0
Detailed packet drop counters:
no out intf 0 out intf down 100 no out PVC 0
in PVC down 0 out PVC down 0 pkt too big 0
pvc create time 00:25:32, last time pvc status changed 00:06:31
Verifying the NSF/SSO Local Switching Configuration
Layer 2 local switching provides NSF/SSO support for Local Switching of the following attachment circuits on the same router:
•Ethernet (port mode) to Ethernet VLAN
•Frame Relay to Frame Relay
For information about configuring NSF/SSO on the Route Processors, see the Stateful Switchover feature module. To verify that the NSF/SSO: Layer 2 Local Switching is working correctly, follow the steps in this section.
SUMMARY STEPS
1. ping
2. redundancy force-switchover
3. show connect all
4. ping
DETAILED STEPS
Step 1 Issue the ping command or initiate traffic between the two CE routers.
Step 2 Force the switchover from the active RP to the standby RP by using the redundancy force-switchover command. This manual procedure allows for a "graceful" or controlled shutdown of the active RP and switchover to the standby RP. This graceful shutdown allows critical cleanup to occur.
Step 3 Issue the show connect all command to ensure that the Layer 2 Local Switching connection on the dual RP is operating.
ID Name Segment 1 Segment 2 State
2 Eth-Vlan1 Fa1/1/1 Fa6/0/0/0.1 UP
Step 4 Issue the ping command from the CE router to verify that the contiguous packet outage was minimal during the switchover.
Troubleshooting Tips
You can troubleshoot Layer 2 local switching using the following commands on the PE router:
•debug atm l2transport
•debug conn
•debug frame-relay pseudowire
•show frame-relay pvc
•show connection
•show atm pvc
Configuration Examples for Layer 2 Local Switching
This section provides the following configuration examples:
•ATM-to-ATM Local Switching: Example
•ATM PVC Same-Port Switching: Example
•ATM PVP Same-Port Switching: Example
•ATM-to-Ethernet Local Switching: Examples
•Ethernet VLAN Same-Port Switching: Example
•ATM-to-Frame Relay Local Switching: Example
•Frame Relay-to-Frame Relay Local Switching: Example
•Frame Relay DLCI Same-Port Switching: Example
•HDLC Local Switching: Example
•NSF/SSO: Ethernet Port Mode to Ethernet VLAN Local Switching: Example
ATM-to-ATM Local Switching: Example
The following example shows local switching on ATM interfaces configured for AAL5:
connect aal5-conn atm1/0/0 0/100 atm2/0/0 0/100
ATM PVC Same-Port Switching: Example
The following example shows same-port switching between two PVCs on one ATM interface:
connect conn atm1/0/0 0/100 atm1/0/0 0/200
ATM PVP Same-Port Switching: Example
The following example shows same-port switching between two PVPs on one ATM interface:
connect conn atm1/0/0 100 atm1/0/0 200
ATM-to-Ethernet Local Switching: Examples
ATM-to-Ethernet local switching terminates an ATM frame to an Ethernet/VLAN frame over the same PE router. Two interworking models are used: Ethernet mode and IP mode.
ATM to Ethernet VLAN: Example
The following example shows an Ethernet interface configured for Ethernet VLAN, and an ATM PVC interface configured for AAL5 encapsulation. The connect command allows local switching between these two interfaces and specifies the interworking type as Ethernet mode.
interface fastethernet6/0/0.1
connect atm-ethvlan-con atm2/0/0 0/400 fastethernet6/0/0.1 interworking ethernet
ATM to Ethernet Port Mode: Example
The following example shows an Ethernet interface configured for Ethernet and an ATM interface configured for AAL5SNAP encapsulation. The connect command allows local switching between these two interfaces and specifies the interworking type as IP mode.
interface fastethernet6/0/0
connect atm-eth-con atm0/0/0 0/100 fastethernet6/0/0 interworking ip
Ethernet VLAN Same-Port Switching: Example
The following example shows same-port switching between two VLANs on one Ethernet interface:
interface fastethernet0/0.1
interface fastethernet0/0.2
connect conn FastEthernet0/0.1 FastEthernet0/0.2
ATM-to-Frame Relay Local Switching: Example
The following example shows a serial interface configured for Frame Relay and an ATM interface configured for AAL5SNAP encapsulation. The connect command allows local switching between these two interfaces.
encapsulation frame-relay
connect atm-fr-conn atm1/0 7/100 serial1/0 100 interworking ip
Frame Relay-to-Frame Relay Local Switching: Example
The following example shows serial interfaces configured for Frame Relay. The connect command allows local switching between these two interfaces.
encapsulation frame-relay
frame-relay interface-dlci 100 switched
frame-relay intf-type dce
encapsulation frame-relay ietf
frame-relay interface-dlci 200 switched
frame-relay intf-type dce
connect fr-con serial3/0/0 100 serial3/1/0 200
Frame Relay DLCI Same-Port Switching: Example
The following example shows same-port switching between two data links on one Frame Relay interface:
encapsulation frame-relay
connect conn serial1/0 100 serial1/0 200
HDLC Local Switching: Example
The following example shows local switching of two serial interfaces for HDLC:
connect conn1 serial1/0 serial1/0
NSF/SSO: Ethernet Port Mode to Ethernet VLAN Local Switching: Example
The following configuration uses the network topology shown in Figure 2.
Figure 2 NSF/SSO: Layer 2 Local Switching: Ethernet to Ethernet VLAN
The following example shows the configuration of the the CE interfaces to connect to the PE1 router:
CE1
|
CE2
|
ip routing
!
interface fa3/1/0
description: connection to PE fa1/1/1
no shutdown
ip address 10.1.1.1 255.255.255.0
|
ip routing
!
interface fa4/0
no shutdown
!
interface fa4/0.1
description: connection to PE1 fa6/0/0.1
encapsulation dot1Q 10
ip address 10.1.1.2 255.255.255.0
!
interface fa4/0.2
description - connection to PE1 fa6/0/0.2
encapsulation dot1Q 20
ip address 172.16.1.2 255.255.255.0
|
The following example shows the configuration of the PE1 router with NSF/SSO and the PE interfaces to the CE routers:
PE1
|
redundancy
no keepalive-enable
mode sso
!
hw-module slot 2 image disk0:rsp-pv-mz.shaft.111004
hw-module slot 3 image disk0:rsp-pv-mz.shaft.111004
!
ip routing
ip cef distributed
!
interface fa1/1/1
description - connection to CE1 fa3/1/0
no shutdown
no ip address
!
interface fa4/0/0
description - connection to CE3 fa6/0
no shutdown
no ip address
!
interface fa6/0/0
no shutdown
no ip address
!
interface fa6/0/0.1
description - connection to CE2 fa4/0.1
encapsulation dot1Q 10
no ip address
!
interface fa6/0/0.2
description - connection to CE2 fa4/0.2
encapsulation dot1Q 20
no ip address
|
The following example shows the configuration of ICMP Router Discovery Protocol (IRDP) on the CE router for Interworking IP for ARP mediation:
CE1
|
CE2
|
interface FastEthernet3/1/0
ip irdp
ip irdp maxadvertinterval 0
|
interface FastEthernet4/0.1
ip irdp
ip irdp maxadvertinterval 0
|
The following example shows the configuration of OSPF on the CE routers:
CE1
|
CE2
|
interface loopback 1
ip address 10.11.11.11 255.255.255.255
!
router ospf 10
network 10.11.11.11 0.0.0.0 area 0
network 192.168.1.1 0.0.0.0 area 0
|
interface loopback 1
ip address 12.12.12.12 255.255.255.255
!
router ospf 10
network 10.12.12.12 0.0.0.0 area 0
network 192.168.1.2 0.0.0.0 area 0
|
The following example shows the configuration of local switching on the PE1 router for interworking Ethernet:
connect eth-vlan1 fa1/1/1 fa6/0/0.1 interworking ethernet
connect eth-vlan2 fa4/0/0 fa6/0/0.2 interworking ethernet
The following example shows the configuration of local switching on the PE1 router for interworking IP:
connect eth-vlan1 fa1/1/1 fa6/0/0.1 interworking ip
connect eth-vlan2 fa4/0/0 fa6/0/0.2 interworking ip
Additional References
The following sections provide references related to the Layer 2 Local Switching feature.
Related Documents
Standards
Standard
|
Title
|
draft-ietf-l2tpext-l2tp-base-03.txt
|
Layer Two Tunneling Protocol (Version 3) 'L2TPv3'
|
draft-martini-l2circuit-trans-mpls-09.txt
|
Transport of Layer 2 Frames Over MPLS
|
draft-martini-l2circuit-encap-mpls-04.txt
|
Encapsulation Methods for Transport of Layer 2 Frames Over IP and MPLS Networks
|
draft-ietf-ppvpn-l2vpn-00.txt
|
An Architecture for L2VPNs
|
MIBs
MIB
|
MIBs Link
|
None
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To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:
http://www.cisco.com/go/mibs
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RFCs
Technical Assistance
Description
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Link
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The Cisco Technical Support website contains thousands of pages of searchable technical content, including links to products, technologies, solutions, technical tips, and tools. Registered Cisco.com users can log in from this page to access even more content.
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http://www.cisco.com/techsupport
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Command Reference
The following commands are introduced or modified in the feature or features documented in this module. For information about these commands, see the Cisco IOS Wide-Area Networking Command Reference at http://www.cisco.com/en/US/docs/ios/wan/command/reference/wan_book.html. For information about all Cisco IOS commands, go to the Command Lookup Tool at http://tools.cisco.com/Support/CLILookup or to the Cisco IOS Master Commands List.
•connect (L2VPN local switching)
•encapsulation (Layer 2 local switching)
•show connection
Feature Information for Layer 2 Local Switching
Table 1 lists the release history for this feature.
Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.
Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
Note Table 1 lists only the Cisco IOS software release that introduced support for a given feature in a given Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS software release train also support that feature.
Table 1 Feature Information for Layer 2 Local Switching
Feature Name
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Releases
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Feature Information
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Layer 2 Local Switching
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12.0(27)S
12.2(25)S
12.0(30)S
12.0(31)S2
12.0(32)SY
12.2(28)SB
12.4(11)T
12.2(33)SRB
12.2(33)SXH
12.2(33)SB
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The Layer 2 Local Switching feature allows you to switch Layer 2 data between two interfaces on the same router, and in some cases to switch Layer 2 data between two circuits on the same interface port.
The feature was introduced in Cisco IOS Release 12.0(27)S on the Cisco 7200 and 7500 series routers.
The feature was integrated into Cisco IOS Release 12.2(25)S for the Cisco 7500 series router.
In Cisco IOS Release 12.0(30)S, support for same-port switching was added. Support for Layer 2 interface-to-interface local switching was added on the Cisco 12000 series router.
In Cisco IOS Release 12.0(31)S2, support was added for customer edge-facing IP Service Engine (ISE) interfaces on the Cisco 12000 series router.
In Cisco IOS Release 12.0(32)SY, support was added for customer edge-facing interfaces on Engine 5 shared port adapters (SPAs) and SPA Interface Processors (SIPs) on the Cisco 12000 series router.
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In Cisco IOS Release 12.2(28)SB, this feature was updated to include NSF/SSO support on the Cisco 7500 series routers for the following local switching types on nonstop forwarding/stateful switchover (NSF/SSO):
•NSF/SSO—Ethernet-to-Ethernet VLAN local switching support
•NSF/SSO—Frame Relay-to-Frame Relay local switching support
In Cisco IOS Release 12.4(11)T, support was added for the following local switching types for the Cisco 7200 series router:
•Ethernet to Ethernet VLAN
•Same-port switching for Ethernet VLAN
•Frame Relay to Frame Relay
•Same-port switching for Frame Relay
In Cisco IOS Release 12.2(28)SB, supported was added for Local Switching on the Cisco 10000 series router. For information about Layer 2 Local Switching on the Cisco 10000 series routers, see the "Configuring Layer 2 Local Switching " section of the Cisco 10000 Series Router Broadband Aggregation, Leased-Line, and MPLS Configuration Guide.
In Cisco IOS Release 12.2(33)SXH, support was added for like-to-like Local Switching (ATM to ATM, and FR to FR only) on Cisco 6500 series switches and Cisco 7600 series routers. Same-port switching is not supported on those routers.
In Cisco IOS Release 12.2(33)SB, support was added for HDLC Local Switching on the Cisco 7200 series router and the Cisco 10000 series router. For information about the Layer 2 Local Switching feature on the Cisco 10000 series routers, see the "Configuring Layer 2 Local Switching" section of the Cisco 10000 Series Router Broadband Aggregation, Leased-Line, and MPLS Configuration Guide.
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