RE: OSPF Route type when ospf as PE-CE routing protocol

Hello Gaurav,

All of the documentation I can find, including a search of most of the
clueful books on Safari, the RFCs and a general Google search indicate that
we "should" see route type 1 for LSA type 1 and route type 2 for LSA type 2.

I always see route type 2 as the extended community value for the OSPF
internal routes in another site. This does NOT however point to a Type 2,
Network LSA; even p-p loopback interfaces are reported as route type 2.

I think Cisco simply uses the 2 to indicate an OSPF internal route, not
really an LSA type.

Maybe someone else on the list has more clue.

Best regards,

Bob Sinclair

> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Gaurav Thukral
> Sent: Monday, May 17, 2010 2:33 PM
> To: Group study
> Subject: OSPF Route type when ospf as PE-CE routing protocol
>
> Hi Experts,
>
> I have one doubt regarding Cisco's implementation of OSPF as PE-CE
> routing
> protocol :-
>
> On ingress PE's PE-CE protocol I have LSA type 1 route :-
>
> 106#sh ip ospf 101 database
>
> OSPF Router with ID (44.44.44.2) (Process ID 101)
>
> *Router Link States (Area 0)*
>
> Link ID ADV Router Age Seq# Checksum Link
> count
> *44.44.44.2 44.44.44.2 1759 0x8000000A 0x00AB8F 2*
> 108.108.108.108 108.108.108.108 1760 0x8000000A 0x00B957 2
>
> Summary Net Link States (Area 0)
>
> Link ID ADV Router Age Seq# Checksum
> 11.11.11.0 44.44.44.2 1381 0x80000001 0x004EC5
> 77.77.77.0 44.44.44.2 1381 0x80000001 0x00FC50
> 100.100.100.100 44.44.44.2 1381 0x80000001 0x003663
> 108.108.108.108 108.108.108.108 832 0x80000005 0x005B79
> 111.111.111.111 44.44.44.2 1381 0x80000001 0x003A33
>
> Type-5 AS External Link States
>
> Link ID ADV Router Age Seq# Checksum Tag
> 1.1.1.1 108.108.108.108 832 0x80000005 0x0079ED 0
> 2.2.2.2 108.108.108.108 832 0x80000005 0x00CE14 0
> 106#
>
> Now when this route is redistributed into MP-BGP on local PE, this
> route
> shows as LSA type2 :-
>
> 106#sh ip bgp vpnv4 vrf cust_a *44.44.44.0*
> BGP routing table entry for 1:100:44.44.44.0/24, version 40
> Paths: (1 available, best #1, table cust_a)
> Advertised to update-groups:
> 1
> Local
> 0.0.0.0 from 0.0.0.0 (106.106.106.106)
> Origin incomplete, metric 0, localpref 100, weight 32768, valid,
> sourced, best
> Extended Community: RT:1:100 OSPF DOMAIN
> ID:0x0005:0x000000650200
> *OSPF RT:0.0.0.0:2:0* OSPF ROUTER ID:44.44.44.2:512,
>
> mpls labels in/out 26/nolabel
>
>
> According to my understanding and also have gone through PE-CE RFC, it
> should have been LSA type 1 only.
> Anyone can help me understand this behavior.
>
> Thanks in advance.
>
>
> --
> Regards,
>
> *Gaurav Thukral*
>
>
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Received on Mon May 17 2010 - 21:49:58 ART