After configuring IS-IS on routers R1 and R2, an engineer notices that only the loopback interface at 2000:1::1 /96 is known to router R2. Which change must be made so that only Loopback2 is advertised from R1 to R2?
A.
Configure the router isis area1 command under the Loopback0 interface on R1.
B.
Remove the advertise passive-only command under the IS-IS address family ipv6 configuration
C.
Remove the ipv6 router isis area1 command under the Loopback2 interface on R1.
D.
Remove the passive-interface Loopback0 command under the router isis area1 configuration.
In the provided configuration for R1, only the Loopback0 interface has been assigned an IPv6 address, and there is no indication that the interface has been configured to be passive or not to advertise in IS-IS. On R2, the routing information base (RIB) shows that the Loopback0 interface IPv6 prefix from R1 is known.
To ensure that only Loopback2 is advertised from R1 to R2, the following change should be made:
B. Remove the advertise passive-only command under the IS-IS address family ipv6 configuration
This command, when configured, would cause R1 to advertise only those interfaces configured as passive. Since the current configuration does not show the interface configurations in full, and the advertise passive-only command is not explicitly shown, this answer assumes that the command might be present in the full IS-IS configuration. Removing it would allow R1 to advertise non-passive interfaces, such as Loopback2, assuming Loopback2 is configured to participate in IS-IS and is not set as passive.
Options A and D are incorrect because they reference the Loopback0 interface, which is the one currently being advertised, and making changes to this interface will not affect the advertisement of Loopback2.
Option C is also incorrect because removing the ipv6 router isis area1 command from the Loopback2 interface would stop R1 from advertising Loopback2 altogether, which is the opposite of the intended goal.
Only Lo2 can be advertised from R1 to L2!
Similar case:
!
router isis area1
net 47.0010.0000.0000.0000.0001.0001.1111.1111.1111.00
!
interface loopback 0
ipv6 address 2001:688:1001:1000::1/128
exit
!
interface Ethernet 0/0
ipv6 address 2001:688:1001:100A::1/64
ipv6 router isis area1
exit
!
router isis area1
passive-interface loopback 0
address-family ipv6
advertise passive-only
when you remove passive-interface loopback 0 - not be advertised anymore, but also E0/0 will not be advertised because of "advertise passive-only" which is still in the config.
So only solution is here to remove "advertise passive-only" under the IS-IS address family ipv6 configuration
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Storcaks
9 months, 4 weeks agoStorcaks
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11 months, 3 weeks agoDUsoo
1 year ago