Yep, there is a bug in older versions of IOS that supported dot1q trunks. If you're running an older version, you can't have the native VLAN on a subinterface. Place the configuration for the native (untagged) VLAN on the major interface and only use subinterfaces for the other tagged VLANs.
Regards, John http://home.attbi.com/~neiby ________________________________________________ Get your own "800" number Voicemail, fax, email, and a lot more http://www.ureach.com/reg/tag ---- On Tue, 19 Feb 2002, Gandolf ([EMAIL PROTECTED]) wrote: > A problem I have come across on the 3500XL switches and dot1q trunking > is > when the XL switch expected the packets on the native VLAN to be > untagged > and the device on the other end of the trunk expects the packets to be > tagged. This prevents communication through the trunk on the native > VLAN. > The way to get around this is to set the native VLAN to a VLAN that does > not > exist anywhere on your network such as VLAN 999. This way all packets > going > through the trunk are tagged and you will be able to route on vlan 24 > again. > > > ""Sean Knox"" wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > Hi all, I'm having a problem with intervlan routing on a 3500XL. Port > > FastEthernet0/17 is an access link and the host, part of VLAN23, is > working > > fine and can traverse the network. FastEthernet 0/18 is a 802.1q trunk > link > > connected to a 802.1q aware host (a special network device my company > > makes). Vlan24 is defined as the native vlan for this link on both > sides > > (the switch and 802.1q host). Connected to the 3500XL's FastEthernet > 0/1 > is > > a router with subifs defined with IP addresses and appropriate 802.1q > VLAN > > tags for each vlan. VLAN23, our access link, is routed fine throughout > the > > network. However, I can't ping the 802.1q host on VLAN24 from the > connected > > router or elsewhere. The 802.1q device has its default gateway set to > the > > corresponding router subinterface. What am I missing? Below are the > relevant > > parts of the 3500XL config and router config. > > > > Thanks in advance! > > Sean > > > > > > > > Relevant parts of show running-config on 3500XL: > > > > interface FastEthernet0/1 > > duplex full > > speed 100 > > switchport trunk encapsulation dot1q > > switchport mode trunk > > > > interface FastEthernet0/17 > > duplex full > > speed 100 > > switchport access vlan 23 > > spanning-tree portfast > > > > interface FastEthernet0/18 > > duplex half > > speed 100 > > switchport trunk encapsulation dot1q > > switchport trunk native vlan 24 > > switchport mode trunk > > spanning-tree portfast > > > > interface VLAN1 > > ip address 10.6.200.2 255.255.255.0 > > no ip directed-broadcast > > no ip route-cache > > ! > > ip default-gateway 10.6.200.1 > > > > Switch#show vlan > > VLAN Name Status Ports > > ---- -------------------------------- --------- > > ------------------------------- > > 1 default active Fa0/2, Fa0/3, Fa0/4, > Fa0/5, > > Fa0/6, Fa0/7, Fa0/8, > Fa0/9, > > Fa0/10, Fa0/11, > Fa0/12, > > Fa0/13, > > Fa0/14, Fa0/15, > Fa0/16, > > Fa0/19, > > Fa0/20, Fa0/21, > Fa0/22, > > Fa0/23, > > Fa0/24, Fa0/25, > Fa0/26, > > Fa0/27, > > Fa0/28, Fa0/29, > Fa0/30, > > Fa0/31, > > Fa0/32, Fa0/33, > Fa0/34, > > Fa0/35, > > Fa0/36, Fa0/37, > Fa0/38, > > Fa0/39, > > Fa0/40, Fa0/41, > Fa0/42, > > Fa0/43, > > Fa0/44, Fa0/45, > Fa0/46, > > Fa0/47, > > Fa0/48, Gi0/1, Gi0/2 > > 24 VLAN0024 active > > > > VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode > Trans1 > > Trans2 > > ---- ----- ---------- ----- ------ ------ -------- ---- ---- ---- > ------ > > ------ > > 1 enet 100001 1500 - - - - - 1002 > 1003 > > 24 enet 100024 1500 - - - - - 0 > 0 > > > > Router8510#show run > > > > interface FastEthernet1/0/4 > > description Core8500 to 3500XL > > ip address 10.6.200.2 255.255.255.0 > > duplex full > > speed 100 > > > > interface FastEthernet1/0/4.23 > > encapsulation dot1Q 23 > > ip address 10.6.23.1 255.255.255.0 > > > > interface FastEthernet1/0/4.24 > > encapsulation dot1Q 24 > > ip address 10.6.24.1 255.255.255.0 [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=35929&t=35929 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
