Re: MPLS ping not working

For some reason I didn't get the original message.

I think the reason it might not be working in the original request is
that the route shows implicit null. In other words the label will be
popped and forwarded as normal IP traffic.

In this case "show mpls forwarding-table" would probably be more
useful than "show mpls bindings"

here is an article about both ping mpls and traceroute mpls

http://blog.ine.com/2008/11/24/mpls-ping-and-traceroute/

(sorry IPexpert, I didn't see a blog from you about the topic).

-Marc

On Sat, Jun 18, 2011 at 6:26 PM, Rich Collins <nilsi2002_at_gmail.com> wrote:
> Hi,
>
> I'd like to learn some more about this command "ping mpls ipv4 ....".
> Anyway I played around with it and it seems like it might work if you
> try "ping mpls ipv4 20.20.20.0 255.255.255.0". Even if that works I'm
> not sure what it tells us.
>
> I then captured via Wireshark with a normal ping from R1 to see that
> mpls encapsulation was occurring.
>
> -Rich
>
>
> On Sat, Jun 18, 2011 at 2:39 PM, Naufal Jamal <naufalccie_at_yahoo.in> wrote:
>> Hi,
>>
>> I have a 3 router scenario, R1 in the middle R2 in the left and R3 in the
>> right. All the interfaces of routers are advertised through eigrp 100. We have
>> a full ipv4 reachability. I have configured loopbacks on all the routers like
>> R1 has 1.1.1.1 and etc.
>>
>> From R2 i am trying to ping one interface in R3 (20.20.20.2) via MPLS but
>> unable to do so.
>>
>> R2#ping mpls ipv4 20.20.20.2 255.255.255.0
>> Sending 5, 100-byte MPLS Echos to 20.20.20.2/24,
>> timeout is 2 seconds, send interval is 0 msec:
>> Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
>> 'L' - labeled output interface, 'B' - unlabeled output interface,
>> 'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
>> 'M' - malformed request, 'm' - unsupported tlvs, 'N' - no label entry,
>> 'P' - no rx intf label prot, 'p' - premature termination of LSP,
>> 'R' - transit router, 'I' - unknown upstream index,
>> 'X' - unknown return code, 'x' - return code 0
>> Type escape sequence to abort.
>> QQQQQ
>> Success rate is 0 percent (0/5)
>>
>> Below are the ouputs of ldp neigbors and ldp bindings from R2. Any guess why
>> the mpls ping is not working here??
>>
>> R2#sh mpls ldp nei
>> Peer LDP Ident: 20.20.20.2:0; Local LDP Ident 2.2.2.2:0
>> TCP connection: 20.20.20.2.14310 - 2.2.2.2.646
>> State: Oper; Msgs sent/rcvd: 62/61; Downstream
>> Up time: 00:47:00
>> LDP discovery sources:
>> Targeted Hello 10.10.10.2 -> 20.20.20.2, passive
>> Addresses bound to peer LDP Ident:
>> 20.20.20.2 3.3.3.3
>> Peer LDP Ident: 1.1.1.1:0; Local LDP Ident 2.2.2.2:0
>> TCP connection: 1.1.1.1.646 - 2.2.2.2.58751
>> State: Oper; Msgs sent/rcvd: 56/59; Downstream
>> Up time: 00:43:04
>> LDP discovery sources:
>> FastEthernet0/0, Src IP addr: 10.10.10.1
>> Addresses bound to peer LDP Ident:
>> 10.10.10.1 1.1.1.1 20.20.20.1
>>
>> R2#sh mpls ldp binding
>> tib entry: 1.1.1.0/24, rev 21
>> local binding: tag: 17
>> remote binding: tsr: 20.20.20.2:0, tag: 17
>> remote binding: tsr: 1.1.1.1:0, tag: imp-null
>> tib entry: 2.2.2.0/24, rev 9
>> local binding: tag: imp-null
>> remote binding: tsr: 20.20.20.2:0, tag: 18
>> remote binding: tsr: 1.1.1.1:0, tag: 16
>> tib entry: 3.3.3.0/24, rev 23
>> local binding: tag: 18
>> remote binding: tsr: 20.20.20.2:0, tag: imp-null
>> remote binding: tsr: 1.1.1.1:0, tag: 17
>> tib entry: 10.10.10.0/24, rev 17
>> local binding: tag: imp-null
>> remote binding: tsr: 20.20.20.2:0, tag: 16
>> remote binding: tsr: 1.1.1.1:0, tag: imp-null
>> tib entry: 20.20.20.0/24, rev 19
>> local binding: tag: 16
>> remote binding: tsr: 20.20.20.2:0, tag: imp-null
>> remote binding: tsr: 1.1.1.1:0, tag: imp-null
>>
>>
>>
>>
>>
>>
>>
>>
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Received on Sat Jun 18 2011 - 18:54:48 ART