O'Reilly logo

Juniper MX Series by Harry Reynolds, Douglas Richard Hanks Jr.

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Summary

MC-LAG is a simple but yet effective feature that can be used to increase the performance and resiliency in your network. You’re able to choose between an active-active or active-standby topology that best fits your use case. For example, when creating full mesh topology of IEEE 802.1Q links between different tiers of a network, it would make sense to use an active-active topology to fully utilize each of the links and also provide resiliency during a failure scenario.

ICCP is the heart and soul of MC-LAG; it leverages existing and well-understood technologies such as TCP/IP and BFD, which make the configuration and troubleshooting very easy for new users. ICCP serves as a very simple and extendable protocol that keeps track of state changes, configuration changes, and signal information between routers.

One of the most common use cases for MC-LAG is to dual-home CE devices. This comes in the form of top-of-rack switches or providing node redundancy for customer routers in a WAN environment. The benefits of MC-LAG are:

  • No spanning tree is required; MC-LAG has built-in features in the PFE to detect and prevent Layer 2 loops.

  • The CE implementation is transparent and only requires IEEE 802.3ad.

  • The PE implementation of MC-LAG doesn’t require a reboot and is less disruptive to the network.

  • The design of MC-LAG allows each PE to operate independently from the other. In the event of a misconfiguration of a PE, the error would be isolated to that particular PE router and not impact the ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required