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Table Of Contents
Duplicate Ring Protocol (DRiP)
How DRiP Advertisements are Transmitted
Configure IP Routing over TRISL
Define the VLAN Encapsulation Format
Assign IP Address to Network Interface
Configure IPX Routing over TRISL
Define the VLAN Encapsulation Format
Configure NetWare on the Subinterface
Configure a Pseudo-ring on the TRISL Subinterface to Cache RIF
Enable Use of the RIF with Routed Protocols
Attach TrCRF to the Router's Ring Group
Enable the Automatic Spanning-Tree Function
Transparent Bridging between Token Ring and TRISL VLAN
SRB between Token Ring and TRISL VLAN
SR/TLB between a TRISL VLAN and an Ethernet Interface
SR/TLB between a TRISL VLAN and an Ethernet ISL VLAN
Routing with RIF between a TRISL VLAN and a Token Ring Interface
IP Routing with RIF between TrBRF VLANs
IP Routing between a TRISL VLAN and an Ethernet ISL VLAN
Token Ring Inter-Switch Link
Feature Summary
The Token Ring Inter-Switch Link (TRISL) feature is a Cisco protocol for interconnecting multiple routers and switches and maintaining VLAN information as traffic goes between routers and switches. The TRISL feature provides a method to transport native Token Ring frames from multiple VLANs across a 100 MB Fast Ethernet link.
The following Cisco routers support the transmission of Token Ring frames from multiple VLANs across a 100 Mbps Fast Ethernet link:
Cisco 7500 or Cisco 7200 routers installed with any one of the following port adapters:
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Two-port Fast Ethernet/ISL 100BaseTX
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The two-port Fast Ethernet/ISL port adapters support frame sizes up to 17800 bytes and the one-port Fast Ethernet port adapters support a frame size of 1500 bytes.
TRISL provides a bridging technology between switches and routers that will transport traffic from both types of LANs.
The TRISL feature provides the following new functions for routers and switches:
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TRISL uses a Fast Ethernet interface to provide connectivity between routers and switches or between switches and extends the VLAN capabilities of a switch by tagging the standard Token Ring frame with the necessary VLAN information.
For detailed information on how Token Ring switching is implemented on switches, refer to the Catalyst Token Ring Switching Implementation Guide.
Overview of TRISL
This section contains the following overview information:
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Token Ring VLANs
A VLAN is a logical group of LAN segments, independent of physical location, with a common set of requirements. If the end stations are located close to one another, they can be grouped into a LAN segment. If any of the end stations are on a different LAN segment, they can be grouped into a VLAN that has the same attributes as a LAN even though the end stations are not all on the same physical segment.
Because a VLAN is essentially a broadcast domain, a Token Ring VLAN is slightly more complex than an Ethernet VLAN. In transparent bridging, there is only one type of broadcast frame and therefore only one level of broadcast domain, but in source routing there are multiple types of broadcast frames that fall into two categories:
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These two categories of broadcast frames result in a broadcast domain that is hierarchical in nature, as a local ring domain can exist only within a domain of all the interconnected rings.
In a Token Ring VLAN, logical ring domains are formed by defining groups of ports that have the same ring number. The IEEE calls such a port group a Concentrator Relay Function (CRF). On Cisco routers and Catalyst switches, such a grouping of Token Ring ports is called a Token Ring CRF (TrCRF).
The domain of interconnected rings is formed using an internal multiport bridge function that the IEEE calls a Bridge Relay Function (BRF). On Cisco routers and Catalyst switches, such a grouping of logical rings is called a Token Ring BRF (TrBRF).
illustrates a TrBRF which contains TrCRFs that exist in a router and a switch.
Figure 1 TrCRFs in a TrBRF
TrCRFs
A TrCRF is a logical grouping of ports.Within the TrCRF, source-route switching is used for forwarding based on either MAC addresses or route descriptors. Frames can be switched between ports within a single TrCRF.
A TrCRF is specified on a router with a ring number and a unique VLAN ID number for the local ring on the router's interface. On switches, TrCRFs comprise one or more physical Token Ring ports. A TrCRF does not contain any physical ports on a router. A TrCRF is confined to the router's physical chassis and is not distributed across a TRISL link. However, if only one TrCRF is defined for a TrNET VLAN, it may be distributed.
A TrBRF on the router can have only one TrCRF. If routing is performed with RIF, the multiring trcrf-vlan command is used to specify the TrCRF for the local ring. If there is a need to cache RIFs for routed traffic bridged across a subinterface, the multiring command is used.
TrBRFs
A TrBRF is a logical grouping of TrCRFs. The TrBRF is used to join different TrCRFs existing in a network of routers and switches that are connected via high-speed links on a TRISL backbone.
A TrBRF is specified with a bridge number and VLAN ID number. The bridge number is used to identify the bridge which interconnects all logical rings (TrCRFs) that have the same parent TrBRF.
A TrBRF can function as an SRB or SRT bridge running either the IBM or IEEE Spanning-Tree Protocol. If SRB is used, duplicate MAC addresses can be defined on different logical rings.
Frame Tagging in TRISL
A standard Token Ring ISL packet contains a frame that is encapsulated with a header that transports VLAN IDs between routers and switches. A Token Ring ISL packet must have a VLAN ID for each logical ring (TrCRF) and a VLAN ID for the entire Token Ring bridged network (TrBRF).
A packet can originate from one TrCRF and have a destination to a different TrCRF that is contained within the same TrBRF. This second level of VLAN IDs requires the ISL header to contain a destination VLAN ID and a source VLAN ID. The destination VLAN ID is used for forwarding and the source VLAN ID is used for learning. The destination VLAN ID can be a TrBRF or a TrCRF.
The Token Ring ISL frame encapsulation is 35 bytes.
Duplicate Ring Protocol (DRiP)
The Cisco Duplicate Ring Protocol (DRiP) runs on Cisco routers and switches that support switched VLAN networking and is used to identify active Token Ring VLANs (TrCRFs).
Through packet advertisements, DRiP maintains the status of TrCRFs. It then uses this information to determine whether there are multiple TrCRFs active in a TrBRF. A single DRiP database exists in a Cisco router.
DRiP information is used for the following:
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To enable the switch to filter out excessive ARE frames, the switch must be aware of the TrCRFs that are attached to the distributed bridge (TrBRF). The DRiP information is used in conjunction with the local configuration to determine which of the TrCRFs configured within a TrBRF have active ports. This information is used on the base switch to correctly filter AREs and on the ISL module to discard AREs that have already been on an attached ring.
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The DRiP information is used in conjunction with the local configuration information to determine which TrCRFs are already active on the switches. If a TrCRF is enabled on more than one switch, the ports associated with the TrCRF are disabled on all switches. A router will not disable the port, instead it generates the following error message indicating that two identical TrCRFs are existing:
DRIP conflict with CRF <vlan-id>
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How DRiP Works
DRiP sends advertisements to a multicast address so the advertisements are received by all neighboring devices (but they are not forwarded by normal bridging procedures). The advertisement includes VLAN information for the source device only. The DRiP database in the router is initialized when TRISL encapsulation is configured, at least one TrBRF is defined, and the interface is configured for SRB or for routing with RIF.
On any subinterface configured with TRISL encapsulation, there can be two different CRF VLANs. If SRB is enabled in the router with TRISL, a VLAN ID is specified for the CRF of the virtual ring. If routing is enabled on the router, a VLAN ID is specified for the CRF of the pseudo-ring.
When a switch receives a DRiP advertisement from a router, it compares the information in the advertisement with its local configuration to determine which TrCRFs have active ports and then denies any configuration that would allow a TrCRF that is already active on another box to be configured on the local switch.
If there is a conflict between two identical TrCRFs, all ports attached to the conflicting TrCRFs are shut down in the switches and the router's ports remain active. If a TrCRF is configured on two devices that share the same TrBRF for bridging between them, and if ports are assigned to these TrCRFs simultaneously, each switch or router will send a DRiP advertisement. The switch with the higher MAC address will disable the port and the router displays an error message.
If a trunk connection is lost and the router does not get DRiP advertisements on that trunk port for two minutes, all entries associated with that trunk port are removed.
DRiP Advertisements
A DRiP advertisement is sent at periodic intervals (30 seconds) by the router. Even if no change in status or configuration has taken place, the configuration revision number is updated. The periodic message will indicate that nothing has changed and the new revision number is provided.
A router also generates a DRiP advertisement when one of the following occurs:
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How DRiP Advertisements are Transmitted
Advertisements are transmitted on the fast Ethernet port default VLAN (VLAN1) which corresponds to the type of trunk link. Thus, only one copy is transmitted on a trunk port, no matter how many VLANs are defined.
DRiP Frame Format
DRiP is assigned the Cisco HDLC protocol type value 0x0102. A Cisco-proprietary SNAP value is used.
The SNAP format is as follows:
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Benefits
Following are the benefits of TRISL:
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List of Terms
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Platforms
The TRISL feature is supported in Cisco IOS Release 11.3(4)T in the following software images:
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The following routers installed with Cisco IOS Release 11.3(4)T support the TRISL feature:
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Configuration Tasks
To configure routing between any number of TRISL VLANs in your network, perform the following tasks:
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To configure and monitor TRISL in your network, perform the following tasks:
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Configure IP Routing over TRISL
The IP routing over TRISL VLANs feature extends IP routing capabilities to include support for routing IP frame types in VLAN configurations.
Enable IP Routing
IP routing is automatically enabled in the Cisco IOS software for routers. To reenable IP routing if it has been disabled, perform the following task in global configuration mode:
Once you have IP routing enabled on the router, you can customize the characteristics to suit your environment. If necessary, refer to the IP configuration chapters in the Network Protocols Configuration Guide, Part 1 for guidelines on configuring IP.
Define the VLAN Encapsulation Format
To define the encapsulation format as TRISL, perform these tasks in interface configuration mode:
The DRiP database is automatically enabled when TRISL encapsulation is configured, and at least one TrBRF is defined, and the interface is configured for SRB or for routing with RIF.
Assign IP Address to Network Interface
An interface can have one primary IP address. To assign a primary IP address and a network mask to a network interface, perform the following task in interface configuration mode:
A mask identifies the bits that denote the network number in an IP address. When you use the mask to subnet a network, the mask is then referred to as a subnet mask.
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Configure IPX Routing over TRISL
The IPX Routing over ISL VLANs feature extends Novell NetWare routing capabilities to include support for routing all standard IPX encapsulations for Ethernet frame types in VLAN configurations. Users with Novell NetWare environments can configure either SAP or SNAP encapsulations to be routed using the TRISL encapsulation across VLAN boundaries. The SAP (Novell Ethernet_802.2) IPX encapsulation is supported for VLAN traffic.
NetWare users can now configure consolidated VLAN routing over a single VLAN trunking interface. With configurable Ethernet encapsulation protocols, users have the flexibility of using VLANs regardless of their NetWare Ethernet encapsulation. Configuring Novell IPX encapsulations on a per-VLAN basis facilitates migration between versions of Netware. NetWare traffic can now be routed across VLAN boundaries with standard encapsulation options (sap and snap) previously unavailable. Encapsulation types and corresponding framing types are described in the "Configuring Novell IPX" chapter of the Network Protocols Configuration Guide, Part 2.
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To configure Cisco IOS software to exchange different IPX framing protocols on a router with connected VLANs, perform these tasks in the order in which they appear.
Enable NetWare Routing
To enable IPX routing on TRISL interfaces, perform this task in global configuration mode:
Define the VLAN Encapsulation Format
To define the encapsulation format as TRISL, perform these tasks in interface configuration mode:
Configure NetWare on the Subinterface
After you enable NetWare globally and define the VLAN encapsulation format, you need to enable the subinterface by specifying the NetWare network number (if necessary) and the encapsulation type. Perform this task in interface configuration mode:
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Configure a Pseudo-ring on the TRISL Subinterface to Cache RIF
You can configure the Cisco IOS software so that it will append RIF information to the routed protocols. This allows routed protocols such as IP or IPX to be bridged across a source-route bridged network.
To enable the use of RIF for specific VLANs on a subinterface, perform the following task in interface configuration mode:
Enable collection and use of RIF information on a TRISL subinterface.
multiring trcrf-vlan vlanid ring ring-number
Enable Use of the RIF with Routed Protocols
To enable collection and use of the RIF information on TRISL subinterfaces on the router, perform the following task in interface configuration mode:
Enable collection and use of RIF information with routed protocols.
multiring {protocol-keyword [all-routes | spanning | all | other}
If you enabled RIF for a TRISL subinterface, you must also enable RIF with the protocols used on the TRISL subinterfaces.
For more information on configuring RIF and bridging routed protocols, see the chapter "Configuring Source-Route Bridging" in the Cisco IOS Release 11.3 Bridging and IBM Networking Guide.
Attach TrCRF to the Router's Ring Group
To attach a TrCRF to the router's ring group, perform the following task:
Attach to the router's virtual ring.
source-bridge trcrf-vlan vlanid ring-group ring-number
If SRB or SR/TLB is used on the router, you must attach TrCRFs to the ring group.
Enable the Automatic Spanning-Tree Function
The automatic spanning-tree function supports automatic resolution of spanning trees in SRB networks, which provides a single path for spanning explorer frames to traverse from a given node in the network to another. Spanning explorer frames have a single-route broadcast indicator set in the routing information field. Port identifiers consist of ring numbers and bridge numbers associated with the ports. The spanning-tree algorithm for SRB does not support Topology Change Notification BPDU.
Although the automatic spanning-tree function can be configured with SR/TLB, the SRB domain and transparent bridging domain have separate spanning trees. Each Token Ring interface can belong to only one spanning tree. Only one bridge group can run the automatic spanning-tree function at a time.
To enable the automatic spanning-tree function for a specified group of bridged interfaces in SRB or SR/TLB, perform the following task in interface configuration mode:
Enable the automatic spanning-tree function on a group of bridged interfaces.
source-bridge spanning bridge-group.
Clear DRiP
To clear DRiP counters, perform the following task:
When DRiP counters are cleared, the counter is reset to 0. When the DRiP counters begin to increment, it indicates that the router is receiving packets.
Display DRiP
To display DRiP information, perform the following task:
Clear VLAN Statistics
To clear VLAN statistics, perform the following task in privileged EXEC mode:
Remove VLAN statistics from any statically or system configured entries.
clear vlan statistics
Display VLANs
To display a summary of VLAN subinterfaces, perform the following task in privileged EXEC mode:
Configuration Examples
The following sections provide TRISL configuration examples:
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Transparent Bridging between Token Ring and TRISL VLAN
illustrates transparent bridging between a router's Token Ring interface and a TRISL VLAN.
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Transparent Bridging between Token Ring and TRISL VLAN
The following is the configuration for the router:
bridge 1 protocol ieee ! interface Tokenring0bridge-group 1 ! interface FastEthernet0/0.1 encapsulation tr-isl trbrf-vlan 50 bridge-num 11 bridge-group 1The following is the configuration for the Catalyst 5000 switch with a Token Ring switch module in slot 5:
#vtpset vtp domain trislset vtp mode serverset vtp v2 enable#dripset set tokenring reduction enableset tokenring distrib-crf disable#vlansset vlan 50 name trbrf50 type trbrf bridge 0xb stp ieeeset vlan 100 name trcrf100 type trcrf ring 0x64 parent 50 mode srt#enable trunkset trunk 1/2 on#add token port to trcrf 100set vlan 100 5/14SRB between Token Ring and TRISL VLAN
illustrates SRB between a Token Ring interface on a router and a TRISL VLAN.
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SRB between a Token Ring Interface and TRISL VLAN
The following is the configuration for the router with the Token Ring interface:
source-bridge ring-group 100!interface TokenRing3/1ring speed 16source-bridge 10 1 100source-bridge spanning!interface FastEthernet4/0.1encapsulation tr-isl trbrf-vlan 999 bridge-num 14source-bridge trcrf-vlan 40 ring-group 100source-bridge spanning!SRB between TRISL VLANs
illustrates SRB between two TrCRF VLANs. Each VLAN belongs to a different Token Ring VLAN.
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SRB between TRISL VLANs
The following is the configuration for the router:
source-bridge ring-group 101!interface FastEthernet4/0.1encapsulation tr-isl trbrf 999 bridge-num 14source-bridge trcrf-vlan 100 ring-group 101source-bridge spanning!interface FastEthernet4/0.2encapsulation tr-isl trbrf 998 bridge-num 13source-bridge trcrf-vlan 102 ring-group 101source-bridge spanningThe following is the configuration for the Catalyst 5000 switch with the Token Ring switch module in slot 5. The Token Ring port on 5/1 is assigned to TrCRF VLAN 40 and the Token Ring port on 5/2 is assigned to TrCRF VLAN 50.
#vtpset vtp domain trislset vtp mode serverset vtp v2 enable#dripset set tokenring reduction enableset tokenring distrib-crf disable#vlansset vlan 999 name trbrf type trbrf bridge 0xe stp ibmset vlan 100 name trcrf100 type trcrf parent 999 ring 0x65 mode srbset vlan 40 name trcrf40 type trcrf parent 999 ring 0x1 mode srbset vlan 998 name trbrf type trbrf bridge 0xd stp ibmset vlan 102 name trcrf102 type trcrf parent 998 ring 0x65 mode srbset vlan 50 name trcrf50 type trcrf parent 998 ring 0x0a mode srb#add token port to trcrf 40set vlan 40 5/1#add token port to trcrf 50set vlan 50 5/2#enable trunkset trunk 1/2 onIn this configuration, the keyword name is optional and srb is the default mode.
SR/TLB between a TRISL VLAN and an Ethernet Interface
illustrates SR/TLB between a TRISL VLAN and an Ethernet interface.
Figure 5
SR/TLB between a TRISL VLAN and an Ethernet Interface
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source-bridge ring-group 100source-bridge transparent 100 101 6 1!interface Ethernet2/0ip addressbridge-group 1!interface FastEthernet4/0.1encapsulation tr-isl trbrf-vlan 999 bridge-num 14source-bridge trcrf-vlan 200 ring-group 100source-bridge spanning!bridge 1 protocol ieee!The following is the configuration for the Catalyst 5000 switch with an Ethernet card in module 5 and using port 1. The Token Ring port on 5/1 is assigned to TrCRF VLAN 40.
#vtpset vtp domain trislset vtp mode serverset vtp v2 enable#dripset set tokenring reduction enableset tokenring distrib-crf disable#vlansset vlan 999 name trbrf999 type trbrf bridge 0xe stp ibmset vlan 200 name trcrf100 type trcrf parent 999 ring 0x64 mode srbset vlan 40 name trcrf40 type trcrf parent 999 ring 0x1 mode srb#add token port to trcrf 40set vlan 40 5/1#enable trunkset trunk 1/2 onSR/TLB between a TRISL VLAN and an Ethernet ISL VLAN
illustrates SR/TLB between a TRISL VLAN and an Ethernet ISL VLAN.
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SR/TLB between a TRISL VLAN and an Ethernet ISL VLAN
The following is the configuration for the router:
source-bridge ring-group 100source-bridge transparent 100 101 6 1!interface FastEthernet4/0.1encapsulation tr-isl trbrf-vlan 999 bridge-num 14source-bridge trcrf-vlan 20 ring-group 100source-bridge spanning!interface FastEthernet4/0.2encapsulation isl 12bridge-group 1!bridge 1 protocol ieeeThe following is the configuration for the Catalyst 5000 switch with an Ethernet module in slot 2 and a Token Ring switch module in slot 5. In this configuration, the Token Ring port 101 is assigned with the TrCRF VLAN 21, and the Token Ring port 100 is assigned with TrCRF VLAN 20.
#vtpset vtp domain trislset vtp mode serverset vtp v2 enable#dripset set tokenring reduction enableset tokenring distrib-crf disable#vlansset vlan 999 type trbrf bridge 0xd stp ibmset vlan 20 type trcrf parent 999 ring 0x64 mode srbset vlan 21 type trcrf parent 999 ring 0x65 mode srb#add token port to trcrf 21set vlan 21 5/1#add ethernetset vlan 12 type ethernetset vlan 12 2/1set trunk 1/2 onRouting with RIF between a TRISL VLAN and a Token Ring Interface
illustrates routing with RIF between a TRISL VLAN and a Token Ring interface.
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Routing with RIF Between a TRISL VLAN and a Token Ring Interface
The following is the configuration for the router:
source-bridge ring-group 100!interface TokenRing 3/1ip address 4.4.4.1 255.255.255.0!interface FastEthernet4/0.1ip address 5.5.5.1 255.255.255.0encapsulation tr-isl trbrf 999 bridge-num 14multiring trcrf-vlan 200 ring-group 100multiring allThe following is the configuration for the Catalyst 5000 switch with the Token Ring switch module in slot 5. In this configuration, the Token Ring port 1 is assigned to the TrCRF VLAN 40.
#vtpset vtp domain trislset vtp mode serverset vtp v2 enable#dripset set tokenring reduction enableset tokenring distrib-crf disable#vlansset vlan 999 name trbrf type trbrf bridge 0xe stp ieeeset vlan 200 name trcrf200 type trcrf parent 999 ring 0x64 mode srtset vlan 40 name trcrf40 type trcrf parent 999 ring 0x1 mode srt#add token port to trcrf 40set vlan 40 5/1set trunk 1/2 onIP Routing with RIF between TrBRF VLANs
illustrates IP routing with RIF between two TrBRF VLANs.
Figure 8
IP Routing with RIF between TrBRF VLANs
The following is the configuration for the router:
interface FastEthernet4/0.1ip address 5.5.5.1 255.255.255.0encapsulation tr-isl trbrf-vlan 999 bridge-num 14multiring trcrf-vlan 200 ring 100multiring all!interface FastEthernet4/0.2ip address 4.4.4.1 255.255.255.0encapsulation tr-isl trbrf-vlan 998 bridge-num 13multiring trcrf-vlan 300 ring 101multiring allThe following is the configuration for the Catalyst 5000 switch with the Token Ring switch module in slot 5. In this configuration, the Token Ring port 102 is assigned with TrCRF VLAN 40 and the Token Ring port 103 is assigned with TrCRF VLAN 50.
#vtpset vtp domain trislset vtp mode serverset vtp v2 enable#dripset set tokenring reduction enableset tokenring distrib-crf disable#vlansset vlan 999 name trbrf type trbrf bridge 0xe stp ieeeset vlan 200 name trcrf200 type trcrf parent 999 ring 0x64 mode srbset vlan 40 name trcrf40 type trcrf parent 999 ring 0x66 mode srbset vlan 998 name trbrf type trbrf bridge 0xd stp ieeeset vlan 300 name trcrf300 type trcrf parent 998 ring 0x65 mode srbset vlan 50 name trcrf50 type trcrf parent 998 ring 0x67 mode srb#add token port to trcrf 40set vlan 40 5/1#add token port to trcrf 50set vlan 50 5/2set trunk 1/2 onIP Routing between a TRISL VLAN and an Ethernet ISL VLAN
illustrates IP routing between a TRISL VLAN and an Ethernet ISL VLAN.
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IP Routing between a TRISL VLAN and an Ethernet ISL VLAN
The following is the configuration for the router:
interface FastEthernet4/0.1ip address 5.5.5.1 255.255.255.0encapsulation tr-isl trbrf-vlan 999 bridge-num 14multiring trcrf-vlan 20 ring 100multiring all!interface FastEthernet4/0.2ip address 4.4.4.1 255.255.255.0encapsulation isl 12The following is the configuration for the Catalyst 5000 switch with the Ethernet module in slot 2 and a Token Ring switch module in slot 5. In this configuration, the Token Ring port is assigned with TrCRF VLAN 100 and the Ethernet port is assigned with VLAN 12.
#vtpset vtp domain trislset vtp mode serverset vtp v2 enable#dripset set tokenring reduction enableset tokenring distrib-crf disable#vlansset vlan 999 name trbrf type trbrf bridge 0xe stp ibmset vlan 100 name trcrf100 type trcrf parent 999 ring 0x64 mode srbset vlan 20 name trcrf20 type trcrf parent 999 ring 0x64 mode srbset vlan 12 name default type eisl12#add token port to trcrf 100set vlan 100 5/1#add ethernetset vlan 12 2/1set trunk 1/2 onCommand Reference
This section documents the following new TR-ISL configuration commands. All other commands used with this feature are documented in the Cisco IOS Release 11.3 Command Reference.
clear drip counters
Use the clear drip counters privileged EXEC command to clear DRiP counters.
clear drip counters
Syntax Description
None.
Command Mode
EXEC
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3(4)T.
Use the clear drip counters command if you want to check whether the router is receiving any packets. The counters will start at 0. If the counters are incrementing, DRiP is active on the router.
Examples
In the following example, the clear drip counters command is used:
router#clear drip countersrouter#Related Commands
encapsulation tr-isl
show dripencapsulation tr-isl
Use the encapsulation tr-isl subinterface configuration command to enable TRISL, a Cisco proprietary protocol for interconnecting multiple routers and switches and maintaining VLAN information as traffic goes between switches.
encapsulation tr-isl trbrf-vlan vlanid bridge-num bridge-number
Syntax Description
vlan-id
Number identifying the VLAN.
bridge-number
Keyword that specifies the identification number of the bridge number on the ISL trunk. Possible values are 01 to 4095.
Command Mode
Subinterface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3(4)T.
Examples
In the following example, TRISL is enabled on a Fast Ethernet interface:
interface FastEthernet4/0.2 encapsulation tr-isl trbrf-vlan 999 bridge-num 14Related Commands
clear drip counters
clear vlan statistics
multiring
multiring trcrf-vlan
show drip
show vlan
source-bridge trcrf-vlanmultiring trcrf-vlan
Use the multiring trcrf-vlan interface configuration command to configure a pseudo-ring for the subinterface enabled to cache RIFs and the associated TrCRF VLAN ID number. Use the no form of this command to disable the caching of RIFs on the subinterface.
multiring trcrf-vlan vlanid ring ring-number
no multiring trcrf-vlan vlanid ring ring-numberSyntax Description
vlanid
VLAN ID number.
ring-number
Keyword that specifies the logical ring number for Token Ring VLANs.
Command Mode
Interface configuration
Default
Disabled
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3(4)T.
Use the multiring trcrf-vlan command to configure a TrCRF VLAN and the ring associated with it for routed traffic on Token Ring connections on routers.
The multiring command is used for SRB traffic across TrBRFs. When the command is configured, RIFs are cached.
Examples
In the following example, the multiring trcrf-vlan command is used to configure a pseudo-ring for the subinterface:
interface FastEthernet4/0.1ip address 5.5.5.1 255.255.255.0encapsulation tr-isl trbrf-vlan 999 bridge-num 14multiring trcrf-vlan 1000 ring 100Related Commands
clear drip counters
rif
multiring
show drip
show rif
show vlanshow drip
Use the show drip privileged EXEC command to display the status of the DRiP database.
show drip
Syntax Description
None.
Command Mode
Privileged EXEC
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3(4)T.
Examples
In the following example, the output for the show drip command is shown:
72-1#show dripDRIP Database for Mgmt Domain FastEthernet4/0--------------------------------------------------Mac Address 0010-A6AE-B440Vlan 100 Status 30 : l-active, l-config,Mac Address 0010-2F72-C800Vlan 20 Status 0C : r-active, r-config,Vlan 1003 Status 0C : r-active, r-config,Statitics:Advertisements received 126Advertisements processed 1Advertisements transmitted 131Last revision transmitted 0x84Last changed revision transmitted 0x2Related Commands
encapsulation tr-isl
clear drip counters
show vlansource-bridge trcrf-vlan
Use the source-bridge trcrf-vlan privileged EXEC command to attach a VLAN to the router's virtual ring. Use the no form of the command to disable the attachment of a VLAN to the router's virtual ring.
source-bridge trcrf-vlan vlanid ring-group ringnum
Syntax Description
Command Mode
Privileged EXEC
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3(4)T.
Prior to attaching a VLAN to the router's ring, use the encapsulation tr-isl command for the subinterface.
Examples
Following is an example of the source-bridge trcrf-vlan command for an interface where the VLAN ID number and ring group number is specified:
interface FastEthernet4/0.2 source bridge trcrf-vlan 100 ring-group 101Related Commands
show source-bridge
source-bridge ring-group
encapsulation tr-islDebug Commands
Following are the debug commands for TRISL:
debug drip event
Use the debug drip event privileged EXEC command to display debug messages for DRIP events. Use the no form of this command to disable debugging output.
debug drip event
no debug drip eventDefault
Debugging is disabled for DRiP events.
Command Mode
Privileged EXEC
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3(4)T. When a Fast Ethernet subinterface is configured for TRISL encapsulation and a TrCRF is defined, the DRiP protocol is activated. The DRiP protocol adds the VLAN ID specified in the router command to its database and recognizes the VLAN as a locally configured, active VLAN.
Sample Debug Output
Following is an example of debug output for the debug drip event command:
encapsulation tr-isl trbrf-vlan vlanid bridge-num bridge-number
"DRIP :"75-2(config-subif)#encapsulation tr-isl trbrf-vlan 999 bridge-num 9DRiP is initiated when a local VLAN is added to the DRiP database:
DRIP : initThe VLAN ID is added locally when TRISL is configured:
DRIP : configure vlanNo = 100DRiP is configuring the VLAN:VLAN 100 is activated in the database:
DRIP : local status active for vlanNo = 100DRIP : resolve local - DRIP_VLAN_ACTIVEDRiP acknowledges that a VLAN is active and is now capable of printing any debug information, if necessary:
DRIP Change notofication active vlan 100DRIP : State notificationDRIP Change notofication active vlan 100DRiP logs the new VLAN ID:
DRIP : configure - ADD_ID 2DRIP will send an advertisement on all its trunk ports:
DRIP : configure - send_adv = TRUEDRiP provides information of the trunk port and the length of the packet:
DRIP : transmit on 0000.0c50.1900, length = 24DRiP gets a packet from the network:
612B92C0: 01000C00 00000000 0C501900 0000AAAA .........P....**612B92D0: 0300000C 00020000 00000100 0CCCCCCC .............LLL612B92E0: 00000C50 19000020 AAAA0300 000C0102 ...P... **......612B92F0: 01010114 00000002 00000002 00000C50 ...............P612B9300: 19000001 04C00064 04 .....@.d.DRiP gets a packet from the network:
Recvd. pakDRiP recognizes that the VLAN ID it is getting is a new one from the network:
6116C840: 0100 0CCCCCCC ...LLL6116C850: 00102F72 CBFB0024 AAAA0300 000C0102 ../rK{.$**......6116C860: 01FF0214 0002E254 00015003 00102F72 ......bT..P.../r6116C870: C8000010 04C00014 044003EB 14 H....@...@.k.DRIP : remote update - Never heard of this vlanDRiP attempts to resolve any conflicts when it hears of a new VLAN. The value action = 1 means to notify the local platform of change in state:
DRIP : resolve remote for vlan 20 in FastEthernet0/0/0DRIP : resolve remote - action = 1The local platform is notified of change in state:
DRIP Change notification active vlan 20Another new VLAN ID was received in the packet:
DRIP : resolve remote for vlan 1003 in FastEthernet0/0/0No action is required:
DRIP : resolve remote - action = 0Thirty seconds have expired, and DRiP sends its local database entries to all its trunk ports:
DRIP : local timer expiredDRIP : transmit on 0000.0c50.1900, length = 24612B92C0: 01000C00 00000000 0C501900 0000AAAA .........P....**612B92D0: 0300000C 00020000 00000100 0CCCCCCC .............LLL612B92E0: 00000C50 19000020 AAAA0300 000C0102 ...P... **......612B92F0: 01FF0114 00000003 00000002 00000C50 ...............P612B9300: 19000001 04C00064 04 .....@.d.debug drip packet
Use the debug drip packet privileged EXEC command to display debug messages for DRiP packets. Use the no form of this command to disable debugging output.
debug drip packet
no debug drip packetDefault
Debugging is not enabled for DRIP packets.
Command Mode
Privileged EXEC
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3(4)T.
Before you use this command, you can optionally use the clear drip command first. As a result the DRiP counters are reset to 0. If the drip counters begin to increment, the router is receiving packets.
Sample Output
Following is sample output for the debug drip packet command.
The following type of output is displayed when a packet is entering the router and you use the show debug command:
039E5FC0: 0100 0CCCCCCC 00E0A39B 3FFB0028 ...LLL.`#.?{.(039E5FD0: AAAA0300 000C0102 01FF0314 0000A5F6 **............%v039E5FE0: 00008805 00E0A39B 3C000000 04C00028 .....`#.<....@.(039E5FF0: 04C00032 044003EB 0F .@.2.@.k.039FBD20: 01000C00 00000010 ........The following type of output is displayed when a packet is transmitted by the router:
039FBD30: A6AEB450 0000AAAA 0300000C 00020000 &.4P..**........039FBD40: 00000100 0CCCCCCC 0010A6AE B4500020 .....LLL..&.4P.039FBD50: AAAA0300 000C0102 01FF0114 00000003 **..............039FBD60: 00000002 0010A6AE B4500001 04C00064 ......&.4P...@.d039FBD70: 04 .Related Commands
encapsulation tri-isl
debug drip eventError Messages
Following is an error message associated with TRISL.
Error Message DRIP conflict with CRF %.Explanation A DRiP conflict has occurred. The virtual ring's CRF is being reused in the network.
Recommended Action Make sure that the CRF VLAN ID number of the virtual ring is unique in the network.
