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

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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 ...

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