Click the Exhibit button.
BGP routes received on R5 are redistributed into the IS-IS network. You want the redistributed routes to be present in Area 49.0001 Referring to the exhibit, how would this task be accomplished?
A. Configure the set protocols isis ignore-attached-bit parameter on router R5.
B. Configure the set protocols isis ignore-attached-bit parameter on routers R3 and R4.
C. Configure the set protocols isis level 2 wide-metrics-only parameter on routers R3 and R4.
D. Configure the set protocols isis level 1 wide-metrics-only parameter on router R5.
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D is correct, tested in LAB
Should be D.
1. IS-IS L1 external routes are not propagated into L2 by default.
2. Type-135 TLV will be treated as internal as it does not have I/E bit.
3. When you enable ‘wide-metrics-only’ on R5, the router only sends Type-135 TLV for those external prefixes.
Reference: https://kb.juniper.net/InfoCenter/index?page=content&id=KB26187
“… TLV 135 does not have the bit to indicate an internal or external route. So, IPv4 external routes are also programmed as Internal in the ISIS database. …”
I think, it should be applied to ABR routers R3 & R4 so that it can suppress external/internal flag of routes from area 49.0002 to area 49.0001
So correct answer should be : C
Why D is connect?