Re: MPLS VPN OSPF "domain-id" issue

Dear Roman,

Yes you are right. It is working when i enabled "capability vrf-lite".

Can you correct me here also:
If we not see "Routing Bit Set on this LSA" under ospf database so
does it mean that down bit is set? or is there any command to check
down bit is set or not.

Regards,
Anser

On Tue, Feb 16, 2010 at 12:32 AM, Roman Rodichev <romangs_at_iementor.com> wrote:
> your SW1 OSPF process is vrf-enabled, hence it's going to use loop
> prevention check by rejecting type 3 ospf routes with down bit set by R6.
> When you make routes external (different domain-id), then down bit no longer
> applies (normally domain tag is used for loop prevention then). Try
> configuring "capability vrf-lite" on sw1.
>
>
>
> Regards,
>
> Roman Rodichev
> 6xCCIE #7927 (R&S, Security, Voice, Storage, Service Provider, Wireless)
> Instructor, Content Developer
> ieMentor Corporation http://www.iementor.com
> Y!M: roman7927
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Muhammad Anser Khan
> Sent: Monday, February 15, 2010 2:52 PM
> To: Cisco Group
> Subject: MPLS VPN OSPF "domain-id" issue
>
> Dear Experts,
>
> What I understand that, If domain-id is same on both PE, then routes will be
> visible as LSA type 3 on other CE site. And If domain-id is changed then LSA
> type 5.
>
> But I am stuck in a weird issue:
>
> If I set the domain-id same on both PEs then I cannot see any route from
> other CE in the routing table but in the database whereas other site can the
> site A routes as an Internal.
>
> Following is my configuration and the output:
>
> Both are in same VPN_A (both CE are in same Area 1)
>
> SW1 >> R6 >> R5 >> SW2
> (CE >> PE) >>( PE >> CE)
>
> Config SW1:
>
> router ospf 10 vrf VPN_A
> log-adjacency-changes
> network 0.0.0.0 255.255.255.255 area 1
>
> Config R6:
>
> !
> router ospf 10 vrf VPN_A
> domain-id 0.0.0.6
> log-adjacency-changes
> redistribute bgp 100 subnets
> network 0.0.0.0 255.255.255.255 area 1
> !
>
> router bgp 100
> !
> address-family ipv4 vrf VPN_A
> redistribute ospf 10 vrf VPN_A
> no synchronization
> exit-address-family
> !
>
> Config R5:
>
> !
> router ospf 10 vrf VPN_A
> domain-id 0.0.0.5
> log-adjacency-changes
> redistribute bgp 100 subnets
> network 0.0.0.0 255.255.255.255 area 1
> !
>
> router bgp 100
> !
> address-family ipv4 vrf VPN_A
> redistribute ospf 10 vrf VPN_A
> no synchronization
> exit-address-family
> !
>
> Config SW2:
>
> !
> router ospf 10
> log-adjacency-changes
> network 0.0.0.0 0.0.0.0 area 1
> !
>
> ======================
>
> OUTPUT:
>
>>>>>>>> When domain-id is different:
>
> SW1:
>
> Rack1SW1#sh ip route vrf VPN_A ospf 10
>
> Routing Table: VPN_A
>
> 155.1.0.0/24 is subnetted, 2 subnets
> O E2 155.1.58.0 [110/1] via 155.1.76.6, 00:11:49, Vlan76
> 172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
> O E2 172.16.8.8/32 [110/2] via 155.1.76.6, 00:11:46, Vlan76
>
>
>>>>>>> When domain-id is same:
>
> Rack1SW1#sh ip route vrf VPN_A ospf 10
>
> Routing Table: VPN_A
>
>>>>>>> But in the ospf database. I can see the prefixes as a Summary
>>>>>>> LSA
>
> Rack1SW1#sh ip ospf 10 data
>
> OSPF Router with ID (172.16.7.7) (Process ID 10)
>
> Router Link States (Area 1)
>
> Link ID ADV Router Age Seq# Checksum Link count
> 155.1.76.6 155.1.76.6 1727 0x8000000A 0x00DF8A 1
> 172.16.7.7 172.16.7.7 1723 0x8000000E 0x00C80B 2
>
> Net Link States (Area 1)
>
> Link ID ADV Router Age Seq# Checksum
> 155.1.76.7 172.16.7.7 1723 0x80000007 0x00D3EB
>
> Summary Net Link States (Area 1)
>
> Link ID ADV Router Age Seq# Checksum
> 155.1.58.0 155.1.76.6 22 0x80000001 0x00DD18
> 172.16.8.8 155.1.76.6 22 0x80000001 0x002DD1
> Rack1SW1#
>
> ==================================
>
> OUTPUT on SW2:
>
>>>>>>> When domain-id is different:
>
> Rack1SW2#sh ip route ospf
> 155.1.0.0/24 is subnetted, 4 subnets
> O E2 155.1.76.0 [110/1] via 155.1.58.5, 00:12:43, Vlan58
> 172.16.0.0/16 is variably subnetted, 3 subnets, 2 masks
> O E2 172.16.7.7/32 [110/2] via 155.1.58.5, 00:12:15, Vlan58
> O 172.16.5.5/32 [110/2] via 155.1.58.5, 00:12:43, Vlan58
> O E2 192.168.6.0/24 [110/1] via 155.1.58.5, 00:12:43, Vlan58
>
>>>>>>>> When domain id is same:
>
> Rack1SW2#sh ip route ospf
> 155.1.0.0/24 is subnetted, 4 subnets
> O IA 155.1.76.0 [110/2] via 155.1.58.5, 00:00:00, Vlan58
> 172.16.0.0/16 is variably subnetted, 3 subnets, 2 masks
> O IA 172.16.7.7/32 [110/3] via 155.1.58.5, 00:00:00, Vlan58
> O 172.16.5.5/32 [110/2] via 155.1.58.5, 00:12:44, Vlan58
> O E2 192.168.6.0/24 [110/1] via 155.1.58.5, 00:12:44, Vlan58
>
> =================================================================
>
> I dont know why routes are not coming in the routing table when domain-id is
> same?
>
> Please suggest or correct my understanding and commands as well.
>
> Regards,
> Anser
>
>
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Received on Tue Feb 16 2010 - 10:34:04 ART