[j-nsp] BGP RR in MPLS VPN

[Ariff Premji]

Not sure if you've explore this option or not.  You dont need to  
setup LSPs to your RR.  You can place a 0/0 route in inet.3 on the RR  
so that all learnt routes appear as resolvable and hence reflected.

Take a look at the RR config at:

http://www.apricot2006.net/slides/tutorial/tuesday/L3VPN_migration.zip

-A

On Feb 10, 2007, at 2:16 PM, Ihsan Junaidi Ibrahim wrote:

> Hi all,
>
> Bringing up an old topic. :)
>
> I'm having problem creating an LSP on one of my RR to it's own lo0.  
> The reason I'm doing this is to propagate our network loopback  
> prefix to the rest of the PEs, without creating full mesh of LSPs  
> between the PEs and the RRs.
>
> ihsan at kenanga# show label-switched-path to-self
> to 10.254.250.2;
> install 10.254.250.0/24;
>
> And CSPF kept mentioning empty route to the egress.
>
> ihsan at kenanga# run show mpls lsp ingress name to-self extensive
> Ingress LSP: 17 sessions
>
> 10.254.250.2
>   From: 0.0.0.0, State: Dn, ActiveRoute: 0, LSPname: to-self
>   ActivePath: (none)
>   LoadBalance: Random
>   Encoding type: Packet, Switching type: Packet, GPID: IPv4
>   Primary                    State: Dn, No-decrement-ttl
>     Will be enqueued for recomputation in 10 second(s).
>     1 Feb 11 06:08:58 CSPF failed: empty route 10.254.250.2
>   Created: Sun Feb 11 06:08:55 2007
> Total 1 displayed, Up 0, Down 1
>
> I was also recommended to create the LSP to another RR and vice- 
> versa (to get the prefix installed in inet.3) but I want to avoid  
> that because in the event of the dest RR failing (we only have 2  
> RRs), then the NLRI will be marked inactive.
>
> Any ideas anyone?
>
> /ihsan
>
>> Hi Guys,
>>
>> What you are looking for is that in order for the l3bgp table to  
>> have active
>> routes to pass to the other reflector clients the next hop for all  
>> PE¹s in the
>> vpn global table (l3bgp table) must be a LSP learned route.  In the
>> traditional sense this would require a full mesh of lsp¹s to the  
>> RR and a full
>> mesh of lsp¹s to each PE.  A simple work around for this in order  
>> to not have
>> lsp¹s going to the RR from each PE is to build a fake LSP on the  
>> RR to it¹s
>> own loopback. Then install 0/0 under this LSP then their will be a  
>> 0/0 entry
>> in inet.3 which will resolve all next-hops for the PE routes in  
>> the Global vpn
>> table. Of course this will not actually forward traffic. The sole  
>> purpose of
>> this 0/0 is to resolve routes and subsequently allow the RR to  
>> advertise the
>> routes to other clients that are now active.
>>
>>
>> I hope this clears things UP...
>>
>> Cheers,
>>
>> Gary Hauser
>> JNCIE #12, CCIE # 4489
>>
>
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