From: Jian Gu (guxiaojian@gmail.com)
Date: Tue Apr 24 2007 - 03:16:58 ART
What you observed does not seem to be right, by default IOS will advertise a
label upstream for each prefix in its IGP routing table regardless of prefix
length, (JUNOS, however, by default only advertises label for /32 prefix)
Could you please post "sh mpls ldp binding"
On 4/23/07, Iamgoingtobeaccie Iamgoingtobeaccie <
heyiamgoingtobeaccie@yahoo.co.in> wrote:
>
> Thanks Victor. You are right..but in this case R1 is not an egress
> router.Its a P router which is directly connected to R5(whose loopback is
> 5.5.5.5 and its another P router).Since 5.5.5.5 is directly connected to
> R5,R5 should be sending a Implicit null tag to R1.But when the network is
> advertised as /32,R5 is neither sending the implicit tag nor a label to
> R1.So its untagged in R1's Lfib.But when R5's loopback is advertised as
> /24, an implicit tag is sent to R1 by R5 and hence R1's LFIB has a POP tag
> for 5.5.5.0/24.
>
> Could not understand why there is a difference.Will work on it in the
> morning.. I am almost falling from the chair.
>
> Victor Cappuccio <victor@ccbootcamp.com> wrote: Hi,
>
> This is what I understand about those 2 actions in the LFIB
>
> Untagged means the packet will be forwarded out the given interface as IP
> packet (0x0800). The Pop tag mean that the penultimate router labels the
> packet with the null label (label 3). Is an Egress LSR know now that it
> should not process the packet as a labeled packet, the packet should be
> treated as a ip packet.
>
>
> thanks,
> Victor Cappuccio.-
> Network Learning Inc - A Cisco Sponsored Organization (SO) YES! We take
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>
>
> -----Original Message-----
> From: nobody@groupstudy.com on behalf of Iamgoingtobeaccie
> Iamgoingtobeaccie
> Sent: Mon 4/23/2007 11:22
> To: ccielab@groupstudy.com
> Subject: MPLS
>
> Group,
> Do we have a separate list for CCIE-SP??I did subscribe
> to CS,but there is no response to it.
>
> I have a basic MPLS topology with OSPF as the IGP.If I
> adverise the loopbacks with their default network type,their /32 network is
> not being assigned labels.(Untagged) When I change the network type to
> point-to-point,i see pop-tag is attached in the "show mpls forwarding"
> command which is expected.
>
> Is there a problem with Implicit null tag for /32 networks here.
>
> R1#sh mpls for
> Local Outgoing Prefix Bytes tag Outgoing Next Hop
> tag tag or VC or Tunnel Id switched interface
> 43 Untagged 5.5.5.5/32 0 Et0/0 190.1.18.5
>
>
> R1#sh mpls for
> Local Outgoing Prefix Bytes tag Outgoing Next Hop
> tag tag or VC or Tunnel Id switched interface
> 41 Pop tag 5.5.5.5//24 0 Et0/0 190.1.18.5
>
>
>
>
>
>
>
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