Refer to the exhibit. An engineer is configuring IS-IS on ISP network. Which IS-IS configuration must an engineer implement on router AGG1 so that it establishes connectivity to router AGG6 via the BB3 core router?
Its D, clearly. I simulated this cenario in lab. Assuming there is configured metric of 2000 between BB4, BB5 with AGG6 we already know they are using wide style metric. On this stage BB1 will have ISIS adj however his routing table will be empty. As soon you active wide metrics on AGG1 he start to receive all routes, however he load shares between BB2 and BB3, fixing its interface with BB3 with 1500 will achieve the objective requested.
technically B should work too, as the connecting or core routers are L1/L2 links.
SO answer should be B or D.
But I guess if u are looking to do a like for like then D
The output is impossible. The last four lines of the clns protocol output indicate AGG1 is using narrow metrics, but the interface output shows the metric is 2000, which means it's using wide metrics. D is the answer for the reasons other have posted. I just wanted to complain about another stupid question from Cisco.
I agree its a poorly designed question
The output shown in the question is possible,
but its an abnormal condition of configure/unconfigure.
Try this:
R1#conf t
router isis
metric-style wide
int g0/2
isis metric 2000 level-1
isis metric 2000 level-2
int g0/3
isis metric 2000 level-1
isis metric 2000 level-2
router isis
no metric-style wide
!
messages seen:
Due to removing wide metrics, 'isis metric 2000' configured on int is capped at 63
Now see the same output as shown as in the exhibit. No routers are reachable
Use the cli from Answer B or D to fix it
In fact both B & D are needed to direct the traffic south, or else ecmp will take effect.
The exam authors havent thought this through carefully.
I would vote for either Answer B or D.
Agree with others on D
The metric is 2000 on both the links (metric-style wide)
Setting the metric to 1500 for Gi3 makes it preferred
The last link on AGG5 is L1
using metric higher than 63, so wide metric is the option ... eliminate A, C
current neighborship with both router are L1 and L2, L1 path is preferred over Level 2 so eliminate B .... Right answer si D
Answer is D,
since it is never mentioned they are different area, so we assummed it is same area. usually if different area they will mentioned somewheren in exhibit or must be L2-only link in the topology.. so....to reach AGG6 from AGG1, it will use Level-1 type (since we assume its same area). in this case A and B are eliminated.
and now C or D?...
"show clns protocol" output indicate wide metric is not set because Generate/Accept wide metrics: none
"show clns interface gig2 or 3" output indicate "isis metric 2000" command apply under both interface command.
so to established connectivity, metric value under int gi3 need to lower down from 2000 which is 1500.
I will go for option D. I tested in lab.
Thank you!
and obviously metric-style wide need to apply as well as "show clns protocol" output indicate wide metric is not set because Generate/Accept wide metrics: none
cipikacipiki is right
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_isis/command/irs-cr-book/irs-l1.html
Metric value to be assigned to the link and used to calculate the path cost via the links to destinations. You can configure this metric for Level 1 or Level 2 routing only. For style wide metrics the range is from 1 to 16777214. For style narrow metrics the range is from 1 to 63.
I think the right answer id D. If the metric is 10, it won't be more desirable.
upvoted 2 times
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