Dear Internet Geniuses, I am attempting to set up a solution for a customer where we provide a multipoint Layer 2 bridge over several DSL connections. Unfortunately, the DSL connections are leased and outside of our control. The wholesale provider's network complained to no end believing there was a loop when we simply tried to bridge them together.
So, I am looking towards L2TPv3. The equipment I've got to work with is a 2821 and some 1721s for the L2TPv3 part. What I had intended to do was have each of the remote sites with 1721s terminate their xconnect back to a dot1q subinterface on the 2821, then blast that out somewhere and hairpin the traffic with a bridge. Trouble is, when I move the xconnect on the 2821 from the native Gi0/1 to something like Gi0/1.101 (and change the switchport it's on to trunk mode) I lose connectivity. I am aware of some other posters who have a similar setup (terminating xconnects to the sub-interfaces) but I am not sure if those were tagged or untagged on the remote end. Terribad ASCII art of my lab setup: (untagged frame) V 1721 Fas0 V L2TPv3 V 1721 Eth0 V 2950 untagged vlan 100 V 2950 tagged vlan 100 V 2821 Gig0/0.100 V L2TPv3 Now, here's what works on the 2821 end: interface GigabitEthernet0/1 description L2TPv3_out no ip address duplex full speed 100 xconnect 172.17.1.10 1 encapsulation l2tpv3 manual pw-class test_PWC_1 l2tp id 101 1 l2tp hello test_CLASS_1 And here's what doesn't: interface GigabitEthernet0/1 description L2TPv3_VLANs no ip address duplex full speed 100 ! interface GigabitEthernet0/1.101 description test_site_1 encapsulation dot1Q 101 xconnect 172.17.1.10 1 encapsulation l2tpv3 manual pw-class test_PWC_1 l2tp id 101 1 l2tp hello test_CLASS_1 The tunnels establish find on both variations, however on the tagged version I don't get any traffic through the link and "sh l2tun tun packets" indicates inbound only on each side. Unfortunately the 1721s dont support 802.1q otherwise I'd give that a go. Any help would be appreciated, but please be kind to the newbie :) Thanks --- Ross Halliday Network Operations WTC Communications Office: 613-547-6939 x203 Helpdesk: 866-547-6939 option 2 http://www.wtccommunications.ca _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
