300-510 SPRI: Implementing Cisco Service Provider Advanced Routing SolutionsDemo

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QuestionQ218

Unicast Routing

Refer to the exhibit.

Question Image

An engineer is troubleshooting a network-routing issue in this IS-IS network at the customer’s regional hub. Router 2, which runs Cisco IOS XR Software, cannot see network 10.10.10.0/24 on Router 1. The Layer 2 encapsulations are correct. ARP connectivity is working for the Ethernet interface running IS-IS. Which action resolves the issue?

  • A On router 1, remove the CISCOLIVE keyword after the ip router isis command under interface GigabitEthernet0/2.
  • B Under the router isis command on router 2, change is-type level-1 to is-type level-2.
  • C Under the router isis command on router 1, change is-type level-1 to is-type level-2.
  • D On router 1, add the CISCOLIVE keyword after the ip router isis command under interface GigabitEthernet0/3.
Explanation

A named IS-IS process requires its interfaces to be associated with that same process tag. Router 1's GigabitEthernet0/3, which provides 10.10.10.0/24, has ip router isis without the CISCOLIVE area tag; therefore, the prefix is not part of Router 1's named CISCOLIVE IS-IS process and is not advertised to Router 2. Configuring ip router isis CISCOLIVE on GigabitEthernet0/3 associates the interface and its connected prefix with the active process. Both routers already use Level 1 and the same IS-IS area, so an IS level change is not required.

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