Re: OSPF Sham-Link

Are you by chance learning the sham-link endpoint through OSPF because it is
redistributed from BGP into OSPF on the other PE? Do a show ip route vrf
sham-link. If so, change the AD for external OSPF higher than IBGP or filter
it with a distribute-list inbound.

On Sun, Oct 4, 2009 at 7:22 PM, Santiago Enciso
<santiago.enciso_at_gmail.com>wrote:

> Hello Group, I'm configuring ospf sham link in a small mpls network but
> the
> sham link doesnt come up.
> the config guide says that the ip address used for the SL must belong to
> the
> VRF,
> not be advertised in ospf and be advertised via BGP.
> I created a dummy loopback in the corresponding VRF and then ip address,
> have configured the SL command
> under the ospf process for that vrf but am not sure how to have the dummy
> loopback /32 address be advertised
> via BGP, I mean redistribution or the network command?
>
>
> http://www.cisco.com/en/US/docs/ios/mpls/configuration/guide/mp_ospf_com_backbone_ps6441_TSD_Products_Configuration_Guide_Chapter.html#wp1024430
>
> *
> *
> *
> *
> *interface Loopback100
> description SHAM-LINK
> ip vrf forwarding sham-link
> ip address 10.0.100.1 255.255.255.255
>
> interface Loopback100
> description SHAM-LINK
> ip vrf forwarding sham-link
> ip address 10.0.100.2 255.255.255.255
> *
> *
> *
> *show ip ospf sham-link*
> *Sham Link OSPF_SL0 to address 10.0.100.2 is down*
> *Area 0 source address 10.0.100.1*
> * Run as demand circuit*
> * DoNotAge LSA allowed. Cost of using 1 State DOWN,*
> * Timer intervals configured, Hello 10, Dead 40, Wait 40,*
> *
> router ospf 2 vrf sham-link
> log-adjacency-changes
> area 0 sham-link 10.0.100.1 10.0.100.2
> network 192.168.11.1 0.0.0.0 area 0
>
> router ospf 2 vrf sham-link
> log-adjacency-changes
> area 0 sham-link 10.0.100.2 10.0.100.1
> redistribute bgp 65000 subnets
> network 192.168.22.1 0.0.0.0 area 0
>
>
> If I shut the backdoor link traffic gets routed across the mpls backbone
> *
>
>
> my mpls backbone is oprational
>
> any idea?
>
>
> Thanks
>
> Santiago E
>
>
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-- 
Bryan Bartik
CCIE #23707 (R&S), CCNP
Sr. Support Engineer - IPexpert, Inc.
URL: http://www.IPexpert.com
Blogs and organic groups at http://www.ccie.net