Can we configure Q-in-Q on WS-C3750-24PS

uzairpak123 · ‎11-07-2011

I have WS-C3750-24PS version 12.2(55)SE4. I am configuring PBB VPLS. MY PE/P routers are alcatel 7710/7750

my topology is like that.

CE1<-------> Provider_switch(3750)<-------> PE1 < ----IP/MPLS----> PE2<-------> Provider_switch(3750)<----------->CE2

16 11 11 16

I can ping from CE1 to CE2 but on Wireshark i am unable to capture pakets of 802.1ad ( q-in-q). I tried on each location(ingress/egress) but no success

My switch 3750 configuration is like:

interface GigabitEthernet1/0/1 -----------------> connected to PE1/PE2

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface GigabitEthernet1/0/2 --------------------> connected to CE1/CE2

switchport access vlan 11

switchport mode dot1q-tunnel

no cdp enable

!

Somebody told me that <switchport mode dot1q-tunnel> can support q-in-q but it will remove the tag at egress point. I try to configure a command

<switchport trunk dot1q ethertype 88A8> but i can't because no such command in that IOS

Can anybody help me.

Thankks

terrencepayet · ‎11-08-2011

Hi uzair,

Check this site below:

http://groups.geni.net/geni/wiki/QinqResults#Cisco

HTH.

Regards,

Terence

uzairpak123 · ‎11-08-2011

Hi Terrence,

I checked that....but when i capture trace from 3750 switch(ingress/egress mirror/monitor)...i can't find 802.1ad packet....only 802.1q packets are comming on wireshark.

i don't know why.....because is for that.....and it is working fine.....but 802.1ad packets are not comming on wireshark.

flokki123 · ‎11-08-2011

hi uzair,

i think you might not be able to see the 802.3ad tag as this tag is removed before the packet is switched back to your network.

the .ad tag is only used on the SP switches as far as i know.

maybe this is why you dont see the .ad tag and only the .q tag.

regards,

florian