Chapter Review Answers

  1. Answer: B. As of Junos 11.4, only two PE routers can participate in MC-LAG.

  2. Answer: B. When using MC-LAG in active-active mode, you must use the Trio-based MPC line cards.

  3. Answer: A. Recall that the service-id is used to uniquely identify routing instances across PE routers when forming a MC-LAG instance. Although as of Junos 11.4, MC-LAG d doesn’t support routing instances; the service-id must match between both PE routers under [switch-options service-id].

  4. Answer: B. The chassis-id is used to uniquely identify each PE router when forming a MC-LAG instance. Each PE router needs a different chassis-id.

  5. Answer: A,B. The mc-ae-id has two purposes: glue together MC-LAG interfaces across different PE routers and uniquely identify different logical MC-LAG interfaces. For example, if CE1 was connected to PE1:xe-0/0/0 and PE2:xe-0/0/0, the mc-ae-id would be 1. If CE2 was connected to PE1:xe-0/0/1 and PE2:xe-0/0/1, the mc-ae-id would be 2.

  6. Answer: A,B,D. Redundancy groups are a collection of MC-AE IDs that share the same VLAN IDs. Redundancy groups act as a broadcast medium between PE routers so that application messages are concise and efficient. In this example, the application would be MAC address updates.

  7. Answer: A. Only MC-LAG in active-active mode requires an ICL. The ICL is used as a Layer 2 link between the two PE routers so that as frames arrive from the CE, both the PE routers can handle the frames efficiently.

  8. Answer: D. The MC-LAG node that’s currently in the ...

Get Juniper MX Series now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.

Start your free trial