[c-nsp] ldp-igp

[Mark Tinka]

On Monday 24 November 2008 03:41:07 Marlon Duksa wrote:

> Thanks Mat. That helps a lot.
> But is there any way to select IP instead MPLS for
> forwarding witout ACLs. Say that route x.x.x.x is
> received by OSPF and LDP (FEC mapping). Is there any way
> to enable forwarding only on IP and not MPLS for that
> particular route without ACLs. For example, changing
> preference (or administrative cost) of OSPF to a lower
> value than LDP - something like that but on a per
> interface basis. Or changing preference of LDP to a
> higher value on a global basis. Juniper for example can
> change preference of LDP.

From your initial e-mail I could tell you were trying to do, 
in IOS, what JunOS does, i.e., treat LDP and RSVP as route 
sources and install forwarding entries into the routing 
table with preferences (administrative distance in IOS), 
e.g.,:

[edit]
tinka at lab# run show route table mpls  

mpls.0: 70 destinations, 70 routes (70 active, 0 holddown, 0 
hidden)
Restart Complete
+ = Active Route, - = Last Active, * = Both

0                  *[MPLS/0] 2d 07:17:30, metric 1
                      Receive
1                  *[MPLS/0] 2d 07:17:30, metric 1
                      Receive
2                  *[MPLS/0] 2d 07:17:30, metric 1
                      Receive
299776             *[LDP/9] 09:32:41, metric 1
                      to x.x.x.193 via ge-0/0/0.0, Pop      
                    > to x.x.x.193 via ge-0/1/0.0, Pop      
299776(S=0)        *[LDP/9] 09:32:41, metric 1
                      to x.x.x.193 via ge-0/0/0.0, Pop      
                    > to x.x.x.193 via ge-0/1/0.0, Pop      
299792             *[LDP/9] 09:32:41, metric 1
                      to x.x.x.193 via ge-0/0/0.0, Pop      
                      to x.x.x.194 via ge-0/0/0.0, Pop      
                    > to x.x.x.193 via ge-0/1/0.0, Pop      
                      to x.x.x.194 via ge-0/1/0.0, Pop      
299792(S=0)        *[LDP/9] 09:32:41, metric 1
                    > to x.x.x.193 via ge-0/0/0.0, Pop      
                      to x.x.x.194 via ge-0/0/0.0, Pop      
                      to x.x.x.193 via ge-0/1/0.0, Pop      
                      to x.x.x.194 via ge-0/1/0.0, Pop

I haven't had to treat them as routing protocols in JunOS, 
and just use them for what they are intended - life is 
simpler.

Aside from what others have already mentioned in this 
thread, I'm not sure IOS treats these label distribution 
protocols as routing protocols.

Cheers,

Mark.
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