From: kevin gannon (kevin@gannons.net)
Date: Tue Mar 03 2009 - 19:00:52 ARST
Funny was just working on this in the lab and I do not see the routes always
installed in the LFIB:
The topology is the below. I originate 100.100.100.16 from AS16 and it
reaches AS19.
R16-------eBGP+send-label----------R17-------IGP
BGP+send-label-----R18---------eBGP send-label--------R19
AS16
AS17
AS17 AS19
100.100.100.16
On R18 I see the label installed for 100.100.100.16
R18#show mpls for
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or VC or Tunnel Id Switched interface
16 Pop Label 189.189.189.9/32 0 Fa1/1
189.189.189.9
17 Pop Label 100.100.100.17/32 0 Fa1/0
178.178.178.7
18 20 100.100.100.16/32 0 Fa1/0
178.178.178.7
19 Pop Label 100.100.100.19/32 0 Fa1/1
189.189.189.9
show ip bgp 100.100.100.16
BGP routing table entry for 100.100.100.16/32, version 2
Paths: (1 available, best #1, table Default-IP-Routing-Table)
Advertised to update-groups:
2
16
100.100.100.17 (metric 2) from 100.100.100.17 (100.100.100.17)
Origin IGP, metric 0, localpref 100, valid, internal, best,
mpls labels in/out 18/20
R18(config)#
However on R19 I receive the label via eBGP. However I do not install into
the
MPLS forwarding table but I do not know why ??
R19#show ip bgp 100.100.100.16
BGP routing table entry for 100.100.100.16/32, version 7
Paths: (1 available, best #1, table Default-IP-Routing-Table)
Not advertised to any peer
17 16
189.189.189.8 from 189.189.189.8 (100.100.100.18)
Origin IGP, localpref 100, valid, external, best,
mpls labels in/out nolabel/18
R19#
R19#show mpls for
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or VC or Tunnel Id Switched interface
16 Pop Label 189.189.189.8/32 0 Fa1/0
189.189.189.8
On Tue, Mar 3, 2009 at 8:54 PM, Roman Rodichev <roman@iementor.com> wrote:
> No you don't have to. The router that receives BGP routes with labels will
> put them into the LFIB.
>
>
> Roman Rodichev
> 5xCCIE #7927 (R&S, Security, Voice, Storage, Service Provider)
> Instructor, Content Developer
> ieMentor Corporation http://www.iementor.com
> Y!M: roman7927
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Peter Svidler
> Sent: Tuesday, March 03, 2009 2:50 PM
> To: ccielab@groupstudy.com
> Subject: MPLS send-label
>
> Folks ,
>
> just i want to confirm this , when i use the IPV4 send-label option between
> two PE's running IPV4
>
> even though the labels are send via BGP , it does not insall automatically
> in
> the MPLS table , i still need to redistribute BGP into IGP to get this the
> prefixes installed in the MPLS forwarding table ..is this correct ?
>
>
>
> Blogs and organic groups at http://www.ccie.net
>
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