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The ATM Multilink PPP Support on Multiple VCs feature facilitates traffic load balancing on high-speed virtual circuits (VCs) using multilink PPP (MLP) over Frame Relay and ATM. It also facilitates traffic load balancing by using MLP to combine packet datagrams on high-speed VCs as a means of transporting both the voice and data traffic more efficiently.
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.
The ATM Multilink PPP Support on Multiple VCs feature does not support the following commands and functionality. The configuration accepts these commands, but the commands have no effect:
The ATM Multilink PPP Support on Multiple VCs feature does not support the link fragmentation and interleaving (LFI) functionality.
Load balancing operates at Layer 2 or Layer 3 (the network layer) of the Open System Interconnection (OSI) reference model. Layer 3 load balancing is independent of any link-layer technologies. The ATM Multilink Point-to-Point Protocol (PPP) Support on Multiple VCs feature implements load balancing at Layer 2 and depends on having MLP enabled at the link layer.
The ATM MLP functionality keeps track of packet sequencing, and this functionality buffers any packets that arrive early. With this ability, ATM MLP preserves packet order across the entire bundle.
In addition to MLP, low latency queueing (LLQ) and class-based weighted fair queueing (CBWFQ) are used to prioritize and differentiate the voice and data packets. LLQ and CBWFQ help to ensure that the voice and data traffic receive the proper quality of service (QoS) treatment (such as the correct priority queue assignment) when the voice and data traffic are transmitted.
For more information about LLQ and CBWFQ, see the Cisco IOS Quality of Service Solutions Configuration Guide.
The ATM Multilink PPP Support on Multiple VCs feature supports the transport of real-time (voice) and other (data) traffic on Frame Relay and ATM VCs.
Perform this task to define the service policy using the MQC. The MQC allows you to create class maps and define service policies. Service policies are used to create classes and set match criteria for classifying traffic.
Perform this task to define a multilink MLP bundle interface. The purpose of a multilink bundle interface is to combine more than one permanent virtual circuit (PVC). All configurations for PPP over ATM links are placed into virtual templates, and the bundle parameters are placed into the multilink bundle.
Perform this task to display information about ATM Multilink PPP Support on Multiple VCs:
The following example shows how to configure a service policy using the MQC:
Router> enable Router# configure terminal Router(config)# class-map match-all DATA Router(config-cmap)# match ip precedence 0 Router(config-cmap)# class-map match-all VOICE Router(config-cmap)# match access-group 100 Router(config-cmap)# policy-map CISCO Router(config-pmap)# class VOICE Router(config-pmap-c)# priority percent 70 Router(config-pmap-c)# class DATA Router(config-pmap-c)# bandwidth percent 5 Router(config-pmap-c)# access-list 100 permit udp any any precedence critical
The following example shows how to define a multilink bundle for the mulitilink interface:
Router> enable Router# configure terminal Router(config)# interface Multilink1 Router(config-if)# ip address 10.2.1.1 255.0.0.0 Router(config-if)# load-interval 30 Router(config-if)# no cdp enable Router(config-if)# service-policy output CISCO Router(config-if)# ppp multilink fragment disable Router(config-if)# ppp multilink group 1
The following example shows how to define virtual templates for member links:
Router> enable Router# configure terminal Router(config)# interface Virtual-Template1 Router(config-if)# no ip address Router(config-if)# load-interval 30 Router(config-if)# ppp multilink Router(config-if)# ppp multilink group 1 Router(config-if)# interface Virtual-Template2 Router(config-if)# no ip address Router(config-if)# load-interval 30 Router(config-if)# ppp multilink Router(config-if)# ppp multilink group 1
The following example shows how to define and configure PVCs as bundle members:
Router> enable Router# configure terminal Router(config)# interface atm 6/0 Router(config-if)# no ip address Router(config-if)# load-interval 30 Router(config-if)# atm ilmi-keepalive Router(config-if)# pvc 0/34 Router(config-if-atm-vc)# vbr-nrt 1536 1536 Router(config-if-atm-vc)# tx-ring-limit 5 Router(config-if-atm-vc)# protocol ppp Virtual-Template1 Router(config-if-atm-vc)# pvc 0/35 Router(config-if-atm-vc)# vbr-nrt 800 800 Router(config-if-atm-vc)# tx-ring-limit 3 Router(config-if-atm-vc)# protocol ppp Virtual-Template2 Router(config-if-atm-vc)# pvc 0/36 Router(config-if-atm-vc)# vbr-nrt 800 400 94 Router(config-if-atm-vc)# tx-ring-limit 5 Router(config-if-atm-vc)# protocol ppp Virtual-Template1 Router(config-if-atm-vc)# pvc 0/37 Router(config-if-atm-vc)# vbr-nrt 800 800 Router(config-if-atm-vc)# tx-ring-limit 3 Router(config-if-atm-vc)# protocol ppp Virtual-Template2 Router(config-if-atm-vc)# end
The following sections provide references related to the ATM Multilink PPP Support on Multiple VCs feature.
Related Topic |
Document Title |
---|---|
QoS configuration tasks |
Cisco IOS Quality of Service Solutions Configuration Guide |
QoS commands: complete command syntax, defaults, command mode, command history, usage guidelines, and examples |
Cisco IOS Quality of Service Solutions Command Reference |
WAN configuration tasks |
Cisco IOS Wide-Area Networking Configuration Guide |
WAN commands: complete command syntax, defaults, command mode, command history, usage guidelines, and examples |
Cisco IOS Wide-Area Networking Command Reference |
Cisco IOS commands |
Standard |
Title |
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None |
-- |
MIB |
MIBs Link |
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None |
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) |
Description |
Link |
---|---|
The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies. To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds. Access to most tools on the Cisco Support 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 ATM Multilink PPP Support on Multiple VCs |
Feature Name |
Releases |
Feature Information |
---|---|---|
ATM Multilink PPP Support on Multiple VCs |
12.2(28)SB 12.2(13)T 12.2(33)SRE |
The ATM Multilink PPP Support on Multiple VCs feature facilitates traffic load balancing on high-speed virtual circuits, using MLP over Frame Relay and ATM. It facilitates traffic load balancing by using MLP to combine packet datagrams on high-speed VCs, as a means for transporting both the voice and data traffic more efficiently. |
LFI --link fragmentation and interleaving. Method of fragmenting large packets and then queueing the fragments between small packets.
MLP --multilink PPP.
QoS --quality of service.
VC --virtual circuit.
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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.