12-16-2007 09:38 PM
Hi,everyone!
I've read some books about MPLS L2VPN. But I got some confusion about the conception of L2VPN interworking mode: IP and Ethernet.
As I know, the differences between the two mode is the payload of the packets which transport in the PW. When we use the Ethernet mode, the payload is a ethernet frame and when we use the IP mode , the payload is a IP packet.
And I want to know that, If one side of Attach Circuit is ATM , another side of AC is ethernet. Can we use both of the 2 mode to establish a PW?
12-17-2007 04:52 AM
yes, this is ATOM, any thing over ATM. You can have two different Layer 2 encapsulation speaking at two ends, and then ATOM help you to internetwork them with Layer3 packet which is understood by them. You configure 'internetwking ip' if u hv two diferent L2 encap at two legs of VC.
Regards,
GP
12-17-2007 05:03 AM
There is a scenario:
CE1-(eth)-PE1---PE2-(ATM)-CE2
PE1 and PE2 are 7609, CE1 and CE2 are 7200 with NPE-400.When I use IP mode interworking, It's not work. When I use the Ethernet mode and config the IRB on the CE2, it works, I want to know why .
12-17-2007 06:10 AM
Can u paste the config of two interfaces onPE routers which interface with CE.
Regards,
G
12-17-2007 06:18 AM
PE1:
pseu-class MPLS-IP
en mpls
inter ip
Interface Gi 0/1.10
desc To_CE1
enca dot1q 10
xconnect 10.0.1.1 100 pw-class MPLS-IP
PE2:
Interface atm 2/1/0.100 point-to-point
pvc 0/100 l2tran
en aal5snap
xconnect 10.0.1.2 100 pw-class MPLS-IP
CE1:
interface gi 0/1.10
en dot1q 10
ip add 192.168.0.1 255.255.255.0
CE2:
interface atm 1/0.100 point-to-point
ip address 192.168.0.2 255.255.255.0
pvc 0/100
en aal5snap
10.0.1.1/32 is PE1's ldp router-id
10.0.1.2/32 is PE2's ldp router-id
12-17-2007 07:30 AM
1. Chk if LDP is ok.
2. show mpls l2trans vc de should show you if the 'MPLS VC labels has been exchanged' & 'mtu of both the sides' mtu shud be same. If this does not work.
Ur config looks ok.
12-17-2007 07:35 AM
I'm sure LDP is OK.
I set the ATM MTU to 1500 bytes at the PE2,and the show mpls l2trans vc de show that the vc status UP, and the label stack is OK. But I can not ping from CE1 to CE2
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