I am sorry bro I hate to tell you this but its not C.
Regardless if IOS-XR is older or newer than 6.2.1, there is only one BGP table to store the U and LU routes. This is evident by the fact that you can only configure (enable) "address-family ipv4 unicast" or "address-family ipv6 unicast" under router bgp. You cannot configure "address-family ipv4 labeled-unicast" or "address-family ipv6 labeled-unicast" under router bgp
https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/216498-labeled-and-unlabeled-together-on-one-bg.html
Yes, he is right. Answer C is correct.
You cannot put the "address-family ipv4 labeled-unicast" under the "router bgp 65515", but you can put under the neighbor statement:
router bgp 65515
neighbor 172.16.70.23
address-family ipv4 labeled-unicast
I would love to say its C and I know where your coming from but
Answer C states:
router bgp 65515 neighbor 172.16.70.23 (wrong syntax)
address-family ipv4 labeled unicast
NOT
router bgp 65515
...
neighbor 172.16.70.23
address-family ipv4 labeled-unicast
again here is from the URL I provided earlier on my first comment
router bgp 65003
address-family ipv4 unicast
redistribute connected
allocate-label all unlabeled-path
…
neighbor 10.100.1.7
remote-as 65003
update-source Loopback0
address-family ipv4 unicast
route-reflector-client
!
address-family ipv4 labeled-unicast
route-reflector-client
We see no v6 Config here?!
New Implementation on IOS-XR
In the old implementation on IOS-XR, a warning is given when configuring both the U and LU on the same BGP session. The warning is introduced in IOS-XR releases 5.3.0, and 5.2.2. The warning is removed in IOS-XR release 6.2.1, because labeled and unlabeled are supported on the same BGP session.
I agree with beenardino that the syntax is wrong. However, none of the other options seems to be correct. I am just going to assume that the format of the answer just came out wrong or just a bad question.
answer C is correct, is referering to inter-as option C, or a CSC implementation, both need to establish a bgp ipv4 labeled-unicast adjacency in order to maintain LSP end to end
It's C
https://www.cisco.com/c/en/us/support/docs/multiprotocol-label-switching-mpls/mpls/200523-Configuration-and-Verification-of-Layer.html
https://www.cisco.com/c/en/us/support/docs/multiprotocol-label-switching-mpls/mpls/118846-config-mpls-00.html
Answer C is CORRECT
Seems to be some confusion between enabling neighbors to exchange LU routes & U / LU entries being stored in the same BGP table*.
You can only enable 'address-family ipv4 unicast' under the BGP process* on the router, this is because both U and LU share the same BGP table. While they share the same BGP table this does not necessarily mean they're going to exchange LU routes by default, in order to exchange LU routes under the neighbor* you must configure 'address-family ipv4 labeled-unicast'
----
U - Unicast (AFI 1, SAFI 1)
LU - Labelled Unicast (AFI 1, SAFI 4)
You cannot have neighbor under address-family, you have address-family under neighbor.
I go for answer C
upvoted 1 times
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