02-08-2007 05:22 AM - edited 03-03-2019 03:40 PM
We are running MPLS on a cisco 1841 cpe router. But we cannot see any labels at the core router. We are running TDP as mpls label distribution protocol.
172.25.31.111
Peer TDP Ident: 172.25.32.221:0; Local TDP Ident 172.25.32.12:0
TCP connection: 172.25.32.221.32787 - 172.25.32.12.711
State: Oper; PIEs sent/rcvd: 8/8; ; Downstream
Up time: 00:00:06
TDP discovery sources:
ATM6/0.75, Src IP addr: 10.250.32.14
Addresses bound to peer TDP Ident:
10.250.32.14 172.25.32.221
RU9612#
RU9612#sh tag-switching tdp neighbor
!
interface ATM6/0.75 point-to-point
description ADSL_til_ASKO_Drammen_60355011
bandwidth 1024
ip address 10.250.32.13 255.255.255.252
ip mtu 1500
ip ospf network broadcast
atm route-bridged ip
pvc ASKO21DRAMMEN 253/75
ubr 1216
oam-pvc manage
encapsulation aal5snap
!
tag-switching mtu 1516
tag-switching ip
end
RU9612#
CPE:
!
interface FastEthernet0/1
bandwidth 1024
ip address 10.250.32.14 255.255.255.252
duplex auto
speed auto
mpls label protocol both
mpls ip
mpls mtu 1516
traffic-shape rate 1024000 102400 0 1000
!
ru214#sh tag-switching tdp nei
ru214#sh tag-switching tdp neighbor
Peer TDP Ident: 172.25.32.12:0; Local TDP Ident 172.25.32.221:0
TCP connection: 172.25.32.12.711 - 172.25.32.221.32787
State: Oper; PIEs sent/rcvd: 0/17; Downstream
Up time: 00:08:37
TDP discovery sources:
FastEthernet0/1, Src IP addr: 10.250.32.13
Addresses bound to peer TDP Ident:
172.29.253.12 172.29.252.12 172.25.32.12 10.250.32.13
ru214#
Solved! Go to Solution.
02-08-2007 09:12 AM
Hi Bjornar,
everything looks normal and labels are assigned by both, CPE and PE and learned respectively. The relevant output from the core:
32 Pop tag 172.25.32.221/32 77455 AT6/0.75 10.250.32.14
This (Pop tag) means the core has learned the proper label from the CPE. For directly connected networks a LSR will allocate the implicit-null label - indicated by Pop tag. For normal IP connectivity this will mean an IP packet is sent to the CPE. The feature is called "Penultimate hop popping".
Additionally you can see:
RU9612#sh tag-switching tdp bindings
tib entry: 10.0.0.0/8, rev 18
local binding: tag: 21
remote binding: tsr: 172.29.252.9:0, tag: 20
remote binding: tsr: 172.29.252.10:0, tag: 18
remote binding: tsr: 172.29.252.11:0, tag: 1262
remote binding: tsr: 172.25.32.221:0, tag: 30
The last entry here tells me the core has learned the labels assigned by the cpe (172.25.32.221:0).
So label switching works as far as I can tell. So what is the issue in your case?
Hope this helps!
Regards, Martin
02-08-2007 08:09 AM
Can you please post
"show mpls ldp binding", "show mpls forwarding-table" "show ip route"?
Regards, Martin
02-08-2007 08:40 AM
02-08-2007 09:12 AM
Hi Bjornar,
everything looks normal and labels are assigned by both, CPE and PE and learned respectively. The relevant output from the core:
32 Pop tag 172.25.32.221/32 77455 AT6/0.75 10.250.32.14
This (Pop tag) means the core has learned the proper label from the CPE. For directly connected networks a LSR will allocate the implicit-null label - indicated by Pop tag. For normal IP connectivity this will mean an IP packet is sent to the CPE. The feature is called "Penultimate hop popping".
Additionally you can see:
RU9612#sh tag-switching tdp bindings
tib entry: 10.0.0.0/8, rev 18
local binding: tag: 21
remote binding: tsr: 172.29.252.9:0, tag: 20
remote binding: tsr: 172.29.252.10:0, tag: 18
remote binding: tsr: 172.29.252.11:0, tag: 1262
remote binding: tsr: 172.25.32.221:0, tag: 30
The last entry here tells me the core has learned the labels assigned by the cpe (172.25.32.221:0).
So label switching works as far as I can tell. So what is the issue in your case?
Hope this helps!
Regards, Martin
02-08-2007 09:47 AM
Thank you !
Now it works.
ru214#ping vrf internet2
Protocol [ip]:
Target IP address: 193.216.1.10
Repeat count [5]: 10
Datagram size [100]:
Timeout in seconds [2]:
Extended commands [n]: y
Source address or interface: 172.17.39.1
Type of service [0]:
Set DF bit in IP header? [no]:
Validate reply data? [no]:
Data pattern [0xABCD]:
Loose, Strict, Record, Timestamp, Verbose[none]:
Sweep range of sizes [n]:
Type escape sequence to abort.
Sending 10, 100-byte ICMP Echos to 193.216.1.10, timeout is 2 seconds:
Packet sent with a source address of 172.17.39.1
!!!!!!!!!!
Success rate is 100 percent (10/10), round-trip min/avg/max = 20/24/28 ms
ru214#
regards
Bjornar
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