Re: OSPF Sham-Link

Thanks , Now it is working.Redistribute connected was missing at each bgp
process, that included the loopback100 interface
now the source and destination ip addresses are in the vrf's routing table
and the SL is up and traffic
goes through the mpls backbone as desired.

Santiago E

On Sun, Oct 4, 2009 at 9:40 PM, Bryan Bartik <bbartik_at_ipexpert.com> wrote:

> 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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>>
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>>
>>
>>
>>
>>
>
>
> --
> Bryan Bartik
> CCIE #23707 (R&S), CCNP
> Sr. Support Engineer - IPexpert, Inc.
> URL: http://www.IPexpert.com
>

-- 
-----------------------------
Santiago Enciso
CCNA/CCDA/CCNP
Blogs and organic groups at http://www.ccie.net