Dear All,
I have been trying to do MPLS L2VPN Over GRE for few days. It is
subinterface based l2vpn.
Below goes my Network senario.
-------------------------------------------------------------------
OSPF
Over GRE Tunnel
.....................
.....................
................................
... VXR-7200-A
......................................Cisco 2600
............................. VXR-7200-B ....
.........................
.......................
..............................
. dot1q
--------------------------------------------------------------------
.dot1q
. mpls l2transport route lo VXR -B
. mpls
l2transport route lo-VXR (route carried by OSPF Through Tunnel)
.
.
.
.
.
.
---------------
-----------------
- Cisco 2950
-
- Cisco 2950 -
----------------
--------------------
.
.
.
.
PC1(192.168.1.1/30)
PC2 (192.168.1.2/30)
I am getting a weird problem.* *I can ping the VLAN network across MPLS
l2vpn i.e from PC1 to PC2 for about 5 to 7 minutes and it *stops
automatically* and ever comes up back.
Everything else seems OK. mpls ldp neighbor, mpls forwarding database,
VCs status, GRE Tunnels, OSPF routes are all Ok even when i am unable to
ping PCs.
I am using Cisco IOS 12.4-2(T) on the VXRs. Is there any BUG for Cisco
IOS i am using. If so, please suggest me the bug free IOS for its
implamentation.
'debug mpls l2trasport packets error' showed error report of "*ATOM-Eth
VLAN imposition: in Nu0, ciruit id 110 size 68 packet dropped, Fixup
fauled*".
But this report persists even when when i am able to ping PC1 to PC2
(for 5 to 7 minutes)
My MPLS L2VPN is sub-interface based.
Any help in this regards is highly appreciable.
_*Configuration detals.*_
* _At VXR-7200-A_
*mpls ip*
*mpls label protocol ldp
mpls ldp router-id loopback 0
interface Loopback0
ip address 172.22.0.129 255.255.255.255
ip ospf 1 area 20
!
interface Tunnel0
description #### GRE Tunnel ####
ip address 172.22.15.129 255.255.255.252
ip ospf cost 100
ip ospf 1 area 20
mpls label protocol ldp
mpls ip
tunnel source FastEthernet1/0
tunnel destination 202.70.75.165
Interface fa 1/0
des ### Connected To Cisco 2600 ####
ip address 202.70.77.14 255.255.255.248
Interface fa 1/1.110
des ### Connected Cisco Switch ###
encap dot1q 110
mpls l2transport route 172.22.16.1 110
ip route 202.70.75.164 255.255.255.252 202.70.77.9
*_At VXR-7200-B_
*mpls ip*
*mpls label protocol ldp
mpls ldp router-id loopback 0
interface Loopback0
ip address 172.22.16.1 255.255.255.255
ip ospf 1 area 20
!
interface Tunnel0
description #### GRE Tunnel ####
ip address 172.22.15.130 255.255.255.252
ip ospf cost 100
ip ospf 1 area 20
mpls label protocol ldp
mpls ip
tunnel source FastEthernet1/1
tunnel destination 202.70.77.14
!
interface FastEthernet 1/1
description **** Connected To Cisco 2600 ****
ip address 202.70.75.165 255.255.255.248
ip route-cache flow
duplex full
no cdp enable
!
!
interface FastEthernet1/0.110
des ### Connected To Cisco Switch Below ###
encapsulation dot1Q 90
mpls l2transport route 172.22.0.129 110
ip route 202.70.77.8 255.255.255.248 202.70.75.166
_* At Cisco 2600 *_
interface FastEthernet 1/1
description **** Connected To VXR-7200-A ****
ip address 202.70.77.9 255.255.255.248
interface FastEthernet 0/0
description **** Connected To VXR-7200-B ****
ip address 202.70.75.166 255.255.255.252
Regards,
Khara Nanda Luitel
Subisu Cable Net Pvt Ltd
Nepal.
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