Re: OSPF Domain-id

It totally makes sense as I was looking same route on both sites. The
domain-id shows different when I see routes on remote site that are
redistributed from OSPF into BGP .

Thanks heaps for correcting my understanding.

Rack1R5#show bgp vpnv4 unicast vrf VPN_A 155.1.67.6
BGP routing table entry for 100:1:155.1.67.0/24, version 178
Paths: (1 available, best #1, table VPN_A)
Flag: 0xA00
  Not advertised to any peer
  Local
    150.1.6.6 (metric 66) from 150.1.4.4 (150.1.4.4)
      Origin incomplete, metric 0, localpref 100, valid, internal, best
      Extended Community: RT:100:1 OSPF DOMAIN ID:0x0005:0x000000010200
        OSPF RT:0.0.0.1:2:0 OSPF ROUTER ID:155.1.67.6:0
      Originator: 150.1.66.66, Cluster list: 150.1.4.4
      mpls labels in/out nolabel/23

Domain-id - x00000001

Rack1R6#show bgp vpnv4 unicast vrf VPN_A 155.1.58.8
BGP routing table entry for 100:1:155.1.58.0/24, version 225
Paths: (1 available, best #1, table VPN_A)
Flag: 0xA00
  Not advertised to any peer
  Local
    150.1.5.5 (metric 66) from 150.1.4.4 (150.1.4.4)
      Origin incomplete, metric 0, localpref 100, valid, internal, best
      Extended Community: RT:100:1 OSPF DOMAIN ID:0x0005:0x000000630200
        OSPF RT:0.0.0.1:2:0 OSPF ROUTER ID:172.16.5.5:0
      Originator: 150.1.5.5, Cluster list: 150.1.4.4
      mpls labels in/out nolabel/31

Domain-id - x00000063

Thanks,

Bilal Hansrod

On Sun, Jun 19, 2011 at 2:14 AM, Alberto Santos <albertofsantos_at_gmail.com>wrote:

> Hey Bilal
>
> The domain-id is took from OSPF when redistributing into BGP and than
> compared when redistributed into OSPF in remote PE, if it's different, set
> as external otherwise set as internal OIA. so looking into BGP table at
> remote PE router won't help, because BGP won't change it because it's
> different in OSPF, you may compare the route received via BGP and the domain
> id from show ip ospf from yours VRF to see if is going to be external or
> not.
> you see a route as OIA when removing the domain-id because it's took the
> process id to set the domain ID which are the same at the both routers
>
> PE2 (local originated)
> 00000063 = 0.0.0.99
>
> PE1 (remote PE)
> compare 00000063 with sh ip ospf, which is 0.0.0.11. so external it is.
>
> if you don't want to do hex2dec try to see yours local BGP routes and
> compare between hex's.
>
>
> Thanks
>
> Alberto
>
> On 18 June 2011 11:45, Bilal Hansrod <bilal.hansrod_at_gmail.com> wrote:
>
>> Hello Experts,
>>
>> I have simple MPLS topology running OSPF betwen CE-PE and MP-BGP. When I
>> change domain-id on PE, I can't see the change in real domain-id by
>> running
>> show bgp vpnv4 unicast vrf VPN_A 172.16.8.0, but still the OSPF route type
>> changes to E2.
>>
>> C1 - PE1 - RR - PE2 - C2
>>
>> Both C routers running OSPF between PE with same OSPF process number.
>>
>> The command output as below:
>>
>> PE1
>>
>> Rack1R6#show bgp vpnv4 unicast vrf VPN_A 172.16.8.0
>> BGP routing table entry for 100:1:172.16.0.0/16, version 57
>> Paths: (1 available, best #1, table VPN_A)
>> Not advertised to any peer
>> Local
>> 150.1.5.5 (metric 66) from 150.1.4.4 (150.1.4.4)
>> Origin incomplete, metric 2, localpref 100, valid, internal, best
>> Extended Community: RT:100:1 OSPF DOMAIN ID:0x0005:0x000000630200
>> OSPF RT:0.0.0.0:2:0 OSPF ROUTER ID:172.16.5.5:0
>> Originator: 150.1.5.5, Cluster list: 150.1.4.4
>> mpls labels in/out nolabel/29
>>
>> Configuration:
>> router ospf 10 vrf VPN_A
>> domain-id 0.0.0.11
>> log-adjacency-changes
>> redistribute bgp 100 subnets tag 666
>> network 0.0.0.0 255.255.255.255 area 1
>>
>>
>>
>> PE2
>>
>> ack1R5#show bgp vpnv4 unicast vrf VPN_A 172.16.8.0
>> BGP routing table entry for 100:1:172.16.0.0/16, version 37
>> Paths: (1 available, best #1, table VPN_A)
>> Advertised to update-groups:
>> 1
>> Local
>> 0.0.0.0 from 0.0.0.0 (150.1.5.5)
>> Origin incomplete, metric 2, localpref 100, weight 32768, valid,
>> sourced, best
>> Extended Community: RT:100:1 OSPF DOMAIN ID:0x0005:0x000000630200
>> OSPF RT:0.0.0.0:2:0 OSPF ROUTER ID:172.16.5.5:0
>> mpls labels in/out 29/aggregate(VPN_A)
>>
>> router ospf 10 vrf VPN_A
>> domain-id 0.0.0.99
>> log-adjacency-changes
>> summary-address 172.16.0.0 255.255.0.0
>> redistribute bgp 100 subnets tag 667
>> network 0.0.0.0 255.255.255.255 area 1
>>
>>
>> Should I not be seeing different domain-id for this route; however, both
>> of
>> them shows 63- When I see routes on C routes it changes to E2 and when I
>> remove the domain-id's, I see routes as IA.
>>
>> Any help will be highly appreciated.
>>
>> Thanks,
>>
>> Bilal Hansrod
>>
>>
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Received on Sun Jun 19 2011 - 19:36:10 ART