300-510 · Question #227
Refer to the exhibit. The Cisco router has a single uplink to the upstream network, which is critical to the business. The router is configured for traffic steering with the Autoroute mechanism…
The correct answer is A. Cisco(config)# traffic-eng Cisco(config-sr-te)# policy P1 Cisco(config-sr-te-policy)# autoroute all Cisco(config-sr-te-policy)# candidate-paths Cisco(config-sr-te-policy)# preference 100. Option A is correct because an SR-TE policy requires two things for Autoroute Announce to function: the autoroute all directive (to steer all OSPF/IS-IS prefixes into the tunnel) and a valid candidate-paths entry with a preference value - without a configured candidate path…
Question
Refer to the exhibit. The Cisco router has a single uplink to the upstream network, which is critical to the business. The router is configured for traffic steering with the Autoroute mechanism configured to steer all OSPF and IS-IS prefixes over non-shortest paths and divert traffic for those prefixes to the SR-TE policy. However, the Autoroute Announce functionality for all prefixes is not working. Which additional command set must the engineer configure on the router to correct this issue? A. B. C. D.
Exhibits
Options
- ACisco(config)# traffic-eng Cisco(config-sr-te)# policy P1 Cisco(config-sr-te-policy)# autoroute all Cisco(config-sr-te-policy)# candidate-paths Cisco(config-sr-te-policy)# preference 100
- BCisco(config)# traffic-eng Cisco(config-sr-te)# policy P1 Cisco(config-sr-te-policy)# color 1 end ipv4 255.255.255.255
- CCisco(config)# traffic-eng Cisco(config-sr-te)# policy P1 Cisco(config-sr-te-policy)# autoroute all Cisco(config-sr-te-policy)# preference 10
- DCisco(config)# traffic-eng Cisco(config-sr-te)# policy P1 Cisco(config-sr-te-policy)# color 1 end ipv4 0.0.0.0
How the community answered
(34 responses)- A82% (28)
- B6% (2)
- C3% (1)
- D9% (3)
Explanation
Option A is correct because an SR-TE policy requires two things for Autoroute Announce to function: the autoroute all directive (to steer all OSPF/IS-IS prefixes into the tunnel) and a valid candidate-paths entry with a preference value - without a configured candidate path, the policy has no active forwarding path and remains non-operational, silently breaking AA even if autoroute is configured.
Option B is wrong because color 1 end ipv4 255.255.255.255 configures color-based BGP traffic steering (not Autoroute Announce), and omits both the autoroute keyword and candidate-paths entirely.
Option C is wrong because while it includes autoroute all, the preference 10 is applied at the wrong level - it's a sub-command of autoroute rather than defining a candidate-paths preference, so the policy still has no valid path and remains down.
Option D is wrong for the same reason as B - color 1 end ipv4 0.0.0.0 is color/endpoint steering configuration, not Autoroute Announce, and lacks both required components.
Memory tip: Think of SR-TE AA as a gun needing two parts - autoroute all is the trigger, but candidate-paths preference is the bullet. One without the other fires nothing.
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