From: Andrew Larkins (Andrew.Larkins@btgroup.co.za)
Date: Mon Dec 03 2007 - 03:52:21 ART
Hi,
I have the same problem here on a production router. Upgraded the IOS
and this resolved everything.
Routing was converging across this link correctly, CDP failed, TACACS+
failed.
Go figure....
Andrew
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Tandou Mohamed
Sent: Friday, November 30, 2007 19:35
To: ccielab@groupstudy.com
Subject: Native Vlan and DOT1Q
Importance: Low
GS,
i am trying to figure out what i am doing or missing here.
i am configuring dot1q between my R3 interface and my switch fa0/3. my
R3 interface is connected to SW1 fa0/3 and R4 fa0/0 is connected to SW1
fa0/3. My R6 fa0/1 is connected to my SW2 fa0/6 i am trunking between
SW1 and SW2.
Here is the problem:
When i configure encapsulation dot1Q 30 native under R3 and do the
same thing under my SW1 switchport trunk native vlan 30 i can't ping but
when i remove both configs i can ping.
There is no native vlan configured under R60/0.60 no problem pinging.
Here is my config :
SW1:
interface FastEthernet0/3
switchport trunk encapsulation dot1q
switchport trunk native vlan 30
switchport mode trunk
switchport nonegotiate
duplex full
!
interface FastEthernet0/4
switchport access vlan 30
switchport mode access
duplex full
R3:
interface Ethernet0/0.30
encapsulation dot1Q 30 native
ip address 10.80.80.3 255.255.255.0
!
interface Ethernet0/0.60
encapsulation dot1Q 60
ip address 10.80.90.3 255.255.255.0
R3#ping 10.80.90.6
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.80.90.6, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms R3#
R3#ping 10.80.80.4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.80.80.4, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
R4#ping 10.80.80.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.80.80.3, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
R4#
R6#ping 10.80.90.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.80.90.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms R6#
Thanks,
Mohamed
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