Re: OSPF Forwarding-adjacency in MPLS TE

Hi Prakash,

Am I assuming right that you are expecting OSPF neighborship over the tunnel
interface when MPLS TE FA is enabled?. If so, enabling FA is to advertise
tunnel link in Router LSA and no OSPF neighborship will be formed.

As this tunnel will also be advertised in LSA, now other OSPF router will be
able to calculate the reachability based on TE metric as well. Without this,
you need to only rely on the IGP metric on physical interface.

     R2----R3-----R4--|
    / |
R1 |--R8
   \ |
    R5----R6----R7----|

In above topology, assume you have TE tunnel between R2-R4 and between
R5-R7. With TE FA, you have both tunnels advertised to R1 via OSPF with same
metric so that R1 will load balance between R2 and R5 to reach R8.

Regards,
Nagendra

On Fri, Sep 10, 2010 at 11:15 PM, Prakash Kalsaria <
kalsaria.prakash_at_gmail.com> wrote:

> R1---R2---R3---R4---R5
>
> OSPF as IGP
>
> Bi-directinaol tunnels between R1 --- R5
>
> Bi-directional Forwarding Adjacencies is configured in tunnels
>
>
>
> R1
>
>
>
> mpls traffic-eng tunnels
>
> !
>
> interface Tunnel15
>
> ip unnumbered Loopback0
>
> mpls traffic-eng tunnels
>
> tunnel destination 5.5.5.5
>
> tunnel mode mpls traffic-eng
>
> tunnel mpls traffic-eng forwarding-adjacency holdtime 1500
>
> tunnel mpls traffic-eng path-option 1 explicit name 15
>
> !
>
> router ospf 100
>
> log-adjacency-changes
>
> network 5.5.1.1 0.0.0.0 area 0
>
> network 5.5.12.0 0.0.0.255 area 0
>
> mpls traffic-eng router-id Loopback0
>
> mpls traffic-eng area 0
>
> !
>
> !
>
> !
>
> ip explicit-path name 15 enable
>
> next-address 5.5.12.2
>
> next-address 5.5.23.3
>
> next-address 5.5.34.4
>
> next-address 5.5.45.5
>
> !
>
>
>
> R1#sh ip int bri tun 15
>
> Interface IP-Address OK? Method Status
> Protocol
>
> Tunnel15 5.5.1.1 YES unset up
> up
>
>
>
>
>
> =====================================================================
>
>
>
> mpls traffic-eng tunnels
>
> !
>
> !
>
> interface Tunnel15
>
> ip unnumbered Loopback0
>
> mpls traffic-eng tunnels
>
> tunnel destination 5.5.1.1
>
> tunnel mode mpls traffic-eng
>
> tunnel mpls traffic-eng forwarding-adjacency holdtime 1500
>
> tunnel mpls traffic-eng path-option 1 explicit name 15
>
> no clns route-cache
>
> !
>
> router ospf 100
>
> log-adjacency-changes
>
> network 5.5.5.5 0.0.0.0 area 0
>
> network 5.5.45.0 0.0.0.255 area 0
>
> mpls traffic-eng router-id Loopback0
>
> mpls traffic-eng area 0
>
> !
>
> ip classless
>
> !
>
> no ip http server
>
> !
>
> !
>
> ip explicit-path name 15 enable
>
> next-address 5.5.45.4
>
> next-address 5.5.34.3
>
> next-address 5.5.23.2
>
> next-address 5.5.12.1
>
> !
>
> R5#sh ip int bri tunnel 15
>
> Interface IP-Address OK? Method Status
> Protocol
>
> Tunnel15 5.5.5.5 YES unset up
> up
>
> R5#
>
> ==========================================================
>
>
>
>
>
>
>
> Here u can see === I have only one neighbor .... forming
>
>
>
> R1#sh ip ospf neighbor
>
>
>
> Neighbor ID Pri State Dead Time Address Interface
>
> 5.5.23.2 1 FULL/DR 00:00:37 5.5.12.2
> FastEthernet1/0
>
>
>
> R5#sh ip ospf neighbor
>
>
>
> Neighbor ID Pri State Dead Time Address Interface
>
> 5.5.45.4 1 FULL/DR 00:00:38 5.5.45.4
> FastEthernet1/0
>
>
>
> R1#show ip cef 5.5.5.5 de
>
> 5.5.5.5/32, epoch 0
>
> local label info: global/16
>
> nexthop 5.5.12.2 FastEthernet1/0 label 17
>
> R1#
>
>
>
> R5#sh ip cef 5.5.1.1 de
>
> 5.5.1.1/32, epoch 0
>
> local label info: global/16
>
> nexthop 5.5.45.4 FastEthernet1/0 label 16
>
>
>
> R5#sh mpls for 5.5.1.1
>
> Local Outgoing Prefix Bytes Label Outgoing Next Hop
>
> Label Label or VC or Tunnel Id Switched interface
>
> 16 16 5.5.1.1/32 0 Fa1/0 5.5.45.4
>
> R5#
>
>
>
> R1#sh mpls for 5.5.5.5
>
> Local Outgoing Prefix Bytes Label Outgoing Next Hop
>
> Label Label or VC or Tunnel Id Switched interface
>
> 16 17 5.5.5.5/32 0 Fa1/0 5.5.12.2
>
> R1#
>
>
>
>
>
>
>
>
>
> R5#sh mpls tr forwarding-adjacency
>
> destination 5.5.1.1 has 1 tunnels
>
> Tunnel15 (load balancing metric 0, nexthop 5.5.1.1)
>
> (flags: Forward-Adjacency, holdtime 1500)
>
>
>
>
>
>
>
> R1#sh mpls tr forwarding-adjacency
>
> destination 5.5.5.5 has 1 tunnels
>
> Tunnel15 (load balancing metric 0, nexthop 5.5.5.5)
>
> (flags: Forward-Adjacency, holdtime 1500)
>
>
>
>
>
>
>
> Can any help help me to solve this ....
>
> What i am Missing
>
> i can form Neighbor relationship ..........
>
>
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Received on Sat Sep 11 2010 - 07:54:47 ART