10-10-2008 12:59 AM - edited 03-03-2019 11:52 PM
Hi,
I have a point to point link between 2 Cisco 7200s that I'm being
required to add VLAN tagging to.
Here are the interface configs:
Router A:
interface FastEthernet5/0
no ip address
duplex full
!
interface FastEthernet5/0.253
encapsulation dot1Q 253
ip address xxx.xxx.xxx.249 255.255.255.252
Router B:
interface FastEthernet4/0
no ip address
duplex full
!
interface FastEthernet4/0.253
encapsulation dot1Q 253
ip address xxx.xxx.xxx.250 255.255.255.252
However, when AT&T forces tagging on the ports, I cannot ping from .
249 to .250, and AT&T cannot see my MAC address on their switches
inbetween and zero traffic on the VLAN.
Does anyone have any ideas?
Router A is a 7206VXR running 12.2(4r)
Router B is a 7204VXR running 12.2(12a)
Thank you.
10-10-2008 01:04 AM
Can you check with your provider
1) That they have configured the link as 802.1q trunk
2) That vlan 253 exists on their switch infrastructure
Jon
10-10-2008 06:16 AM
Yes.
I know they have configured the link as 802.1q on vlan 253.
10-11-2008 05:07 AM
I had a similar issue on a couple of our routers they are 2811s, but probably a similar situation. I had to to VLAN tagging for a different reason, but had similar results. What I wound up doing was to remove the IP address from the subinterface and put on apply to the parent interface. Here is a snippet from the config.
!
interface FastEthernet0/1
ip address xx.xx.245.65 255.255.255.252
duplex auto
speed auto
!
interface FastEthernet0/1.1
description $ETH-LAN$
encapsulation dot1Q 20
no snmp trap link-status
!
Once I did that it worked fine.
The HQ end was different because of the hardware we used.
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