RE: Cannot form LDP peer

Hi Jerry,

LDP sets up a TCP session between peers. The endpoints of this session are
the ldp router IDs. Unlike most RIDs, the LDP RID must be a reachable IP
address.

HTH,

-Bob

> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Jerry Chan
> Sent: Monday, June 22, 2009 6:45 PM
> To: Ernest Wambari
> Cc: Cisco certification
> Subject: Re: Cannot form LDP peer
>
> Hi Ernest,
>
> i will try it soon, but what is the reason to force it to modify the
> router-id? is that not only a idenidifier?
>
> THanks,
> Jerry
>
> 2009/6/22 Ernest Wambari <ewambari_at_gmail.com>
>
> > Hi Jerry,
> >
> > Try hard-coding the mpls router id's on both ends using the:"mpls ldp
> > router-id <int> force".
> >
> > Would be a good idea to setup loopback interfaces on R1 and R3 for
> this.
> >
> > Be sure to use the force switch or disable and enable ldp on each
> serial
> > interface after the change.
> >
> > HTH,
> >
> > W.
> >
> >
> > On Mon, Jun 22, 2009 at 7:30 PM, Jerry Chan <temjin1997_at_gmail.com>
> wrote:
> >
> >> Hi Ernest,
> >>
> >> thanks for your reply,
> >> i cannot see anything on R3 when i type "sh mpls ldp nei"
> >> and i only can see the peer on R1 with R2.
> >>
> >> Thanks,
> >> Jerry Chan
> >>
> >> 2009/6/22 Ernest Wambari <ewambari_at_gmail.com>
> >>
> >> Hi Jerry,
> >>>
> >>> Check your mpls ldp router-ids.
> >>>
> >>> Use the "sh mpls ldp nei" to see if R1 and R3 are peering via the
> >>> expected interfaces.
> >>>
> >>> As Joe mentioned,looks like they are not.
> >>>
> >>> Regards,
> >>>
> >>> W.
> >>>
> >>> On Mon, Jun 22, 2009 at 6:42 PM, Jerry Chan
> <temjin1997_at_gmail.com>wrote:
> >>>
> >>>> Hi all expert,
> >>>>
> >>>> *I am now studying the MPLS, start to do the LDP workbook. (using
> GNS3)
> >>>> however, it cannot form peer with a simple connection between R1--
> R3
> >>>> using a
> >>>> serial link or frame-relay.*
> >>>>
> >>>> R1. config
> >>>> =======
> >>>> ip cef
> >>>> mpls label protocol ldp
> >>>> !
> >>>> interface Serial1/3
> >>>> ip address 150.1.13.1 255.255.255.0
> >>>> mpls ip
> >>>> !
> >>>>
> >>>> R3. config
> >>>> =======
> >>>> ip cef
> >>>> mpls label protocol ldp
> >>>> !
> >>>> interface Serial1/3
> >>>> ip address 150.1.13.3 255.255.255.0
> >>>> clock rate 64000
> >>>> mpls ip
> >>>> !
> >>>>
> >>>> *it can ping , can form ospf peer, but cannot form ldp peer. Am I
> do the
> >>>> wrong things?
> >>>> when i type debug mpls ldp tran even on both R1 and R3, it give me
> like
> >>>> these.*
> >>>>
> >>>> Rack10R1#
> >>>> *Jun 22 16:22:45.203: ldp: Rcvd ldp hello; Serial1/3, from
> 150.1.13.3 (
> >>>> 150.1.13.3:0), intf_id 0, opt 0xC
> >>>> *Jun 22 16:22:45.215: ldp: ldp Hello from 150.1.13.3
> (150.1.13.3:0) to
> >>>> 224.0.0.2, opt 0xC
> >>>> *Jun 22 16:22:45.215: ldp: local idb = Serial1/3, holdtime =
> 15000, peer
> >>>> 150.1.13.3 holdtime = 15000
> >>>> *Jun 22 16:22:45.219: ldp: Link intvl min cnt = 2, intvl = 5000,
> idb =
> >>>> Serial1/3
> >>>> *Jun 22 16:22:45.831: ldp: Send ldp hello; Serial1/3, src/dst
> >>>> 150.1.13.1/224.0.0.2, inst_id 0
> >>>>
> >>>> Rack10R3#
> >>>> *Jun 22 16:19:38.887: ldp: Ignore rcvd dir hello to 150.1.13.3
> from
> >>>> 150.1.12.1, Serial1/3; no dhcb
> >>>> *Jun 22 16:19:39.519: ldp: Rcvd ldp hello; Serial1/3, from
> 150.1.13.1 (
> >>>> 150.1.12.1:0), intf_id 0, opt 0xC
> >>>> *Jun 22 16:19:39.523: ldp: Send ldp hello; Serial1/3, src/dst
> >>>> 150.1.13.3/224.0.0.2, inst_id 0
> >>>> *Jun 22 16:19:39.527: ldp: ldp Hello from 150.1.13.1
> (150.1.12.1:0) to
> >>>> 224.0.0.2, opt 0xC
> >>>> *Jun 22 16:19:39.531: ldp: local idb = Serial1/3, holdtime =
> 15000, peer
> >>>> 150.1.13.1 holdtime = 15000
> >>>> *Jun 22 16:19:39.531: ldp: Link intvl min cnt = 2, intvl = 5000,
> idb =
> >>>> Serial1/3
> >>>> *Jun 22 16:19:39.535: ldp: Opening ldp conn; adj 0x6771C238,
> 150.1.13.3
> >>>> <->
> >>>> 150.1.12.1; with normal priority
> >>>>
> >>>> *please kinldy to give me some hits.
> >>>>
> >>>> Thanks
> >>>> *Jerry
> >>>>
> >>>>
> >>>> Blogs and organic groups at http://www.ccie.net
> >>>>
> >>>>
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Received on Mon Jun 22 2009 - 18:53:06 ART