RE: MPLS Aggregate label

Sounds like you know more about mpls than you realize.... I just read in
pepelnjek/guichard MPLS and VPN Architectures page 41, that the egress edge
lsr will request php operation for a specific ip prefix by advertising via
LDP (label 3) or TDP (label 1) to next upstream lsr (that is the ph
lsr)...resulting in impl-null in the label table (lib) of those two lsr's
for that particular ip prefix

aaron

-----Original Message-----
From: John Neiberger [mailto:jneiberger_at_gmail.com]
Sent: Wednesday, March 09, 2011 3:30 PM
To: Aaron
Cc: CCIE KID; Cisco certification
Subject: Re: MPLS Aggregate label

I know virtually nothing about mpls, but isn't this the way PHP works?
It's my understanding that a router advertises the imp-null label for
directly connected interfaces so that the penultimate router will pop
the last label. Is that correct? Or am I completely in the wrong
ballpark? lol

On Wed, Mar 9, 2011 at 1:44 PM, Aaron <aaron1_at_gvtc.com> wrote:
> Just saw this in my lab today... imp-null seems to have some correlation
to
> connected routes.... perhaps someone can shed some light on this
> fact/observation...
>
> R6#sh mpls ip binding
> 10.10.10.0/24
> in label: imp-null
> 140.100.0.0/27
> in label: 24
> 140.100.0.32/27
> in label: 23
> 140.100.0.64/28
> in label: 20
> 140.100.0.84/30
> in label: 22
> 140.100.0.88/30
> in label: 21
> 140.100.1.0/24
> in label: 25
> 140.100.2.0/24
> in label: imp-null
> 140.100.3.0/24
> in label: imp-null
> 151.100.0.0/15
> in label: 34
> 172.16.0.0/16
> in label: 26
> 192.128.128.0/24
> in label: 19
> 199.199.1.0/24
> in label: 29
> 199.199.2.0/24
> in label: 28
> 199.199.3.0/24
> in label: 27
> 199.199.4.0/24
> in label: 33
> 199.199.5.0/24
> in label: 32
> 199.199.6.0/24
> in label: 31
> 199.199.7.0/24
> in label: 30
> 199.199.8.0/24
> in label: 18
> 199.199.9.0/24
> in label: 17
> 199.199.10.0/24
> in label: 16
> R6#
> R6#
> R6#
> R6#sh ip ro con
> R6#sh ip ro connected
> 140.100.0.0/16 is variably subnetted, 8 subnets, 4 masks
> C 140.100.2.0/24 is directly connected, FastEthernet0/0
> C 140.100.3.0/24 is directly connected, FastEthernet0/1
> 10.0.0.0/24 is subnetted, 1 subnets
> C 10.10.10.0 is directly connected, Ethernet4/0
> R6#
>
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
CCIE
> KID
> Sent: Wednesday, March 09, 2011 5:18 AM
> To: Cisco certification
> Subject: MPLS Aggregate label
>
> Hey what is the difference between Aggregate label ,implicit null and
> explicit null label in MPLS
>
>
> --
> With Warmest Regards,
>
> CCIE KID
> IN PURSUIT OF CCIE
>
>
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Received on Wed Mar 09 2011 - 23:06:21 ART