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This module contains conceptual information and configuration tasks for using Multilink PPP over ATM links. Multilink PPP is a method that is used to reduce latency and jitter for real-time traffic.
Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Before using Multilink PPP over ATM links, a policy map must be created. (See the "Prerequisites" section on page 6 .) Policy maps are created using the Modular Quality of Service (QoS) Command-Line Interface (CLI) (MQC).
A virtual template interface is a logical interface that is configured with generic configuration information for a specific purpose or a configuration common to specific users, plus router-dependent information. The template takes the form of a list of Cisco IOS interface commands that are applied to virtual access interfaces, as needed.
A multilink group interface is a collection of interfaces that are bundled together in the multilink PPP configuration. With a multilink group interface, you can bundle interfaces into logical multilink groups.
While the first two procedures are listed as optional, you must choose one or the other according to the Cisco router that you are using in your network.
These steps apply if you are using the Cisco 7500 series router or the Cisco 7600 series router only. If you are using another series of Cisco router, do not complete these steps. Instead, advance to the Configuring Multilink PPP over ATM Links on a Multilink Group Interface.
Before proceeding with this task, you must create a policy map. The policy map contains the configuration parameters used to apply a specific QoS feature, such as distributed LLQ (dLLQ), to the network traffic.
If you are using the Cisco 7500 series router or the Cisco 7600 series router, do not complete these steps. Instead, complete the steps in Configuring Multilink PPP over ATM Links on a Virtual Template Interface.
Before proceeding with this task, you must create a policy map. The policy map contains the configuration parameters used to apply a specific QoS feature, such as distributed LLQ (dLLQ), to the network traffic.
Command or Action | Purpose | |||
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Example: Router> enable |
Enables privileged EXEC mode.
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Example: Router# configure terminal |
Enters global configuration mode. |
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Example: Router(config)# interface multilink 1 |
Creates a multilink bundle and enters interface configuration mode.
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Example: Router(config-if)# ip address 10.10.100.1 255.255.255.0 |
Sets a primary IP address for an interface. This command can also set the optional secondary IP address for an interface.
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Example: Router(config-if)# service-policy output policy1 |
Attaches the previously created QoS traffic policy (policy map). See the "Prerequisites" section on page 3 . The policy map evaluates and applies QoS features for traffic leaving the interface.
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Example: Router(config-if)# service-policy input policy1 |
Attaches the previously created QoS traffic policy (policy map). See the "Prerequisites" section on page 3 . The policy map evaluates and applies QoS features for traffic enteringthe interface.
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Example: Router(config-if)# ppp multilink fragment delay 20 |
Specifies a maximum size in units of time for packet fragments on a Multilink PPP (MLP) bundle.
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Example: Router(config-if)# ppp multilink interleave |
Enables interleaving of packets among the fragments of larger packets on a multilink bundle. |
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Example: Router(config-if)# ppp multilink multiclass |
(Optional) Enables Multiclass Multilink PPP (MCMP) on an interface.
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Example: Router(config-if)# end |
(Optional) Exits interface configuration mode and returns to privileged EXEC mode. |
After configuring Multilink PPP over ATM links on a multilink group interface, the next step is to associate the virtual template interface with the multilink group by completing the steps in the following section.
If you are using a Cisco 7500 series router or a Cisco 7600 series router, advance to the Associating the Virtual Template Interface with an ATM PVC to continue.
Command or Action | Purpose | |
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Example: Router> enable |
Enables privileged EXEC mode.
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Example: Router# configure terminal |
Enters global configuration mode. |
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Example: Router(config)# interface virtual-template 2 |
Creates a virtual template interface that can be configured and applied dynamically in creating virtual access interfaces, and enters interface configuration mode.
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Example: Router(config-if)# no ip address |
Removes an IP address or disables IP processing. |
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Example: Router(config-if)# ppp multilink group 1 |
Restricts a physical link to joining only a designated multilink group interface.
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Example: Router(config-if)# end |
(Optional) Exits interface configuration mode and returns to privileged EXEC mode. |
Command or Action | Purpose | |
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Example: Router> enable |
Enables privileged EXEC mode.
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Example: Router# configure terminal |
Enters global configuration mode. |
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Example: Router(config)# interface atm2/0/0 |
Configures an interface type and enters interface configuration mode.
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Example: Router(config-if)# pvc cisco 0/16 |
Creates or assigns a name to an ATM permanent virtual circuit (PVC) and enters ATM virtual circuit configuration mode.
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Example: Router(config-if-atm-vc)# abr 100 80 |
(Optional) Selects available bit rate (ABR) QoS and configures the output peak cell rate (PCR) and output minimum guaranteed cell rate (MCR) for an ATM PVC.
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Example: Router(config-if-atm-vc)# vbr-nrt 1100 1100 100 |
(Optional) Configures the variable bit rate-nonreal time (VBR-NRT) quality of service (QoS) and specifies the output peak cell rate (PCR), the output sustainable cell rate (SCR), and the output maximum burst cell size (MBS) for an ATM PVC, PVC range, switched virtual circuit (SVC), VC class, or VC bundle member.
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Example: Router(config-if-atm-vc)# protocol ppp virtual-template 2 |
Specifies that PPP is established over the ATM PVC using the configuration from the specified virtual template.
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Example: Router(config-if-atm-vc)# end |
(Optional) Exits ATM virtual circuit configuration mode and returns to privileged EXEC mode. |
Command or Action | Purpose | |
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Example: Router> enable |
Enables privileged EXEC mode.
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Example: Router# show atm pvc |
(Optional) Displays all ATM PVCs and traffic information. |
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Example: Router# show interfaces |
(Optional) Displays statistics for all interfaces that are configured on the router or access server. |
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Example: Router# show ppp multilink |
(Optional) Displays bundle information for multilink bundles. |
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Example: Router# show policy-map interface serial0/0 |
(Optional) Displays the packet statistics of all classes that are configured for all service policies either on the specified interface or subinterface or on a specific PVC on the interface. |
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Example: Router# exit |
(Optional) Exits privileged EXEC mode. |
The following is an example of configuring Multilink PPP over ATM links on a virtual template interface:
Router> enable
Router# configure terminal
Router(config)# interface virtual-template 4
Router(config-if)# bandwidth 32
Router(config-if)# ip address 10.10.100.1 255.255.255.0
Router(config-if)# service-policy output policy1
Router(config-if)# service-policy input policy1
Router(config-if)# ppp multilink
Router(config-if)# ppp multilink fragment delay 20
Router(config-if)# ppp multilink interleave
Router(config-if)# end
The following is an example of configuring Multilink PPP over ATM links on a multilink group interface:
Router> enable
Router# configure terminal
Router(config)# interface multilink 1
Router(config-if)# ip address 10.10.100.1 255.255.255.0
Router(config-if)# service-policy output policy1
Router(config-if)# service-policy input policy1
Router(config-if)# ppp multilink fragment delay 20
Router(config-if)# ppp multilink interleave
Router(config-if)# ppp multilink multiclass
Router(config-if)# end
The following is an example of associating the virtual template interface with the multilink group:
Router> enable
Router# configure terminal
Router(config)# interface virtual-template 2
Router(config-if)# no ip address
Router(config-if)# ppp multilink group 1
Router(config-if)# end
The following is an example of associating the virtual template interface with an ATM PVC:
Router> enable
Router# configure terminal
Router(config)# interface atm2/0/0
Router(config-if)# pvc cisco 0/16
Router(config-if-atm-vc)# abr 100 80
Router(config-if-atm-vc)# protocol ppp virtual-template 2
Router(config-if-atm-vc)# end
The following is an example of the show ppp multilink command output. In this example, one multilink bundle called 7206-2 is on the system. This bundle has two member links: one active link and one inactive link.
Router# show ppp multilink
Multilink1, bundle name is 7206-2
Endpoint discriminator is 7206-2
Bundle up for 00:00:24, 1/255 load
Receive buffer limit 12000 bytes, frag timeout 1000 ms
0/0 fragments/bytes in reassembly list
0 lost fragments, 0 reordered
0/0 discarded fragments/bytes, 0 lost received
0x0 received sequence, 0x0 sent sequence
Member links: 1 active, 1 inactive (max not set, min not set)
Vi3, since 00:00:24
PPPoATM link, ATM PVC 2/101 on ATM2/0/0
Packets in ATM PVC Holdq: 0 , Particles in ATM PVC Tx Ring: 1
Vt1 (inactive)
To use Multilink PPP over Frame Relay, see the "Using Multilink PPP over Frame Relay" module.
To use Multilink PPP over dialer interface links, see the "Using Multilink PPP over Dialer Interface Links" module.
To use Multilink PPP over serial interface links, see the "Using Multilink PPP over Serial Interface Links" module.
The following sections provide references related to using Multilink PPP over ATM links.
Related Topic |
Document Title |
---|---|
QoS commands: complete command syntax, command modes, command history, defaults, usage guidelines, and examples |
Cisco IOS Quality of Service Solutions Command Reference |
LLQ, WFQ, CBWFQ, PQ, CQ, FIFO, and other queueing mechanisms |
"Configuring Weighted Fair Queueing" module |
MQC |
"Applying QoS Features Using the MQC" module |
Multilink PPP configurations |
"Configuring Media-Independent PPP and Multilink PPP" module |
Virtual template interfaces |
"Configuring Virtual Template Interfaces" module |
Multilink PPP overview module |
"Reducing Latency and Jitter for Real-Time Traffic Using Multilink PPP" module |
Multilink PPP over Frame Relay |
"Using Multilink PPP over Frame Relay" module |
Multilink PPP over dialer interface links |
"Using Multilink PPP over Dialer Interface Links" module |
Multilink PPP over serial interface links |
"Using Multilink PPP over Serial Interface Links" module |
Standard |
Title |
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No new or modified standards are supported, and support for existing standards has not been modified. |
-- |
MIB |
MIBs Link |
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No new or modified MIBs are supported, and support for existing MIBs has not been modified. |
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: |
RFC |
Title |
---|---|
RFC 1990 |
The PPP Multilink Protocol (MP) |
RFC 2686 |
Multiclass Extension to Multilink PPP (MCML) |
Description |
Link |
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The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password. |
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Table 1 | Feature Information for Using Multilink PPP over ATM Links |
Feature Name |
Releases |
Feature Information |
---|---|---|
Distributed Link Fragmentation and Interleaving for Frame Relay and ATM Interfaces on Cisco 7500 Series Routers |
12.2(4)T |
The Distributed Link Fragmentation and Interleaving (dLFI) for Frame Relay and ATM Interfaces on Cisco 7500 Series Routers feature extends link fragmentation and interleaving functionality to VIP-enabled Cisco 7500 series routers. This feature was extensively rewritten from the perspective of using Multilink PPP for link fragmentation and interleaving over ATM interface links. |
Distributed Link Fragmentation and Interleaving over Leased Lines |
12.2(8)T |
The Distributed Link Fragmentation and Interleaving over Leased Lines feature extends distributed link fragmentation and interleaving functionality to leased lines. This feature was extensively rewritten from the perspective of using Multilink PPP for link fragmentation and interleaving over ATM interface links. |
MLP LFI over ATM Configuration Scaling |
12.2(25)S 12.2(27)SBA 15.0(1)M |
The MLP LFI over ATM Configuration Scaling feature supports the transport of real-time (voice) and non-real-time (data) traffic on lower-speed Frame Relay and ATM permanent virtual circuits (PVCs) without causing excessive delay of real-time traffic. The following commands were introduced or modified: ppp multilink group |
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Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.