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#1 kaizad

 
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Posted 10 September 2015 - 11:40 AM

Hi Guys,
whats is the difference between below configuration at XR4 or XR3 and what's the correct at the exam

vrf ABC
  rd 9:9
  address-family ipv4 unicast
   network 172.9.0.4/32
   redistribute connected
   allocate-label all
  !
  neighbor 172.9.143.13
   remote-as 112
   address-family ipv4 unicast
    route-policy PASS in
    route-policy PASS out
    as-override
    send-extended-community-ebgp
   !
   address-family ipv4 labeled-unicast
    route-policy PASS in
    route-policy PASS out
    as-override

2nd


vrf ABC
  rd 9:9
  address-family ipv4 unicast
   network 172.9.0.4/32
   redistribute connected
   allocate-label all
  !
  neighbor 172.9.143.13
   remote-as 112
   address-family ipv4 labeled-unicast
    route-policy PASS in
    route-policy PASS out
    as-override
    send-extended-community-ebgp
    site-of-origin 112:1 


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#2 joseph

 
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Posted 10 September 2015 - 11:42 AM

The second one is correct. Your first one does not even make any sense... 



#3 polo

 
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Posted 10 September 2015 - 11:45 AM

Keep in mind that normally you do your label distribution in IGP via LDP, but here since you have BGP for your CSC setup then what you are trying to do is BGP plus label, hence the need for Labeled-unicast in IOS-XR or Send-label in IOS



#4 hippo

 
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Posted 10 September 2015 - 11:49 AM

I agree with you in part. We need to do this because IOS-XR does not support LDP as a PE to CE label advertisement protocol. That is the real reason why you need to labeled bgp in those topologies. If you did not have R3 or R4 as PEs you could do everything with LDP all the the way. 



#5 StevQuiemn

 
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#6 StevQuiemn

 
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#7 StevQuiemn

 
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