Dealing with a mysterious vlan that won't work, right next to an identically configured VLAN on all the same equipment that works fine.
Router A is a cisco 7206 with two vlan subinterfaces on the same port, one (vlan 808) with address 216.24.2.201/30, one (vlan 888) with address 216.24.2.205/30. Gigabit0/2 is a gigE interface to Switch A Switch A is a catalyst 2950. FastEthernet0/1 is a gig-e connection to Router A configured in VLAN trunking mode. Fastethernet0/1 is a 100bt connection to remote switch B, configured as a vlan trunk that only allows vlan 808. Fastethernet0/2 is a 100bt connection to remote switch B, configured as a vlan trunk that only allows vlan 888. Both vlans are defined in both the config and the vlan database. Switch B is a catalyst 2924. FastEthernet0/1 is a 100bt connection to Router B configured in VLAN trunking mode. Fastethernet0/10 is a 100bt connection to remote switch A, configured as a vlan trunk that only allows vlan 808. Fastethernet0/17 is a 100bt connection to remote switch A, configured as a vlan trunk that only allows vlan 888. Both vlans are defined in both the config and the vlan database. Router B is a cisco 7206 with two vlan subinterfaces on the same port, one (vlan 808) with address 216.24.2.201/30, one (vlan 888) with address 216.24.2.205/30. Fastethernet1/0 is a 100bt interface to Switch A So -- RtrA(216.24.2.201,205)----SwA====SwB----RtrB(216.24.2.202,206) >From I can ping between 216.24.2.201 and 216.24.2.202 across vlan 808 fine. I >cannot get traffic either direction between 216.24.2.205 and 216.24.2.206 >across vlan 888. As near as I can tell the vlans are configured identically >through all pieces of equipment, and both have been entered in the vlan >database on both switches. I must be forgetting something about vlan config >somewhere, but I can't figure out where. What am I missing? Pings from core-gw1 (RtrA) core-gw1.noc#ping 216.24.2.202 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 216.24.2.202, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms core-gw1.noc#ping 216.24.2.206 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 216.24.2.206, timeout is 2 seconds: ..... Success rate is 0 percent (0/5) Below is the relevant config info from all the equipment. ================================================================================= On Router A interface GigabitEthernet0/2.808 description HN-808 interconnect to armplc via core-sw3 encapsulation dot1Q 808 ip address 216.24.2.201 255.255.255.252 no cdp enable ! interface GigabitEthernet0/2.888 description HN-888 interconnect to armplc via core-sw3 encapsulation dot1Q 888 ip address 216.24.2.205 255.255.255.252 no cdp enable ================================================================================= On Switch A interface FastEthernet0/1 switchport trunk allowed vlan 808 switchport mode trunk speed 100 duplex full ! interface FastEthernet0/2 switchport trunk allowed vlan 888 switchport mode trunk speed 100 duplex full ! interface GigabitEthernet0/1 switchport mode trunk speed 1000 duplex full ! interface Vlan1 no ip address no ip route-cache ! interface Vlan808 no ip address no ip route-cache shutdown ! interface Vlan888 no ip address no ip route-cache shutdown Switch#show vlan id 808 VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 808 VLAN0808 active Fa0/1, Gi0/1 VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2 ---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------ 808 enet 100808 1500 - - - - - 0 0 Remote SPAN VLAN ---------------- Disabled Primary Secondary Type Ports ------- --------- ----------------- ------------------------------------------ Switch#show vlan id 888 VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 888 VLAN0888 active Fa0/2, Gi0/1 VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2 ---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------ 888 enet 100888 1500 - - - - - 0 0 Remote SPAN VLAN ---------------- Disabled Primary Secondary Type Ports ------- --------- ----------------- ------------------------------------------ ================================================================================= On Switch B interface FastEthernet0/1 description to gw1.armplc duplex full speed 100 switchport trunk encapsulation dot1q switchport mode trunk no cdp enable ! interface FastEthernet0/10 description Hatteras 1 - HN408-U switchport trunk encapsulation dot1q switchport trunk allowed vlan 1,808,1002-1005 switchport mode trunk no cdp enable ! interface FastEthernet0/17 description UNUSED duplex full speed 100 switchport trunk allowed vlan 1,888,1002-1005 switchport mode trunk no cdp enable sw1.armplc#show vlan id 808 VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 808 VLAN0808 active VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2 ---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------ 808 enet 100808 1500 - - - - - 0 0 sw1.armplc#show vlan id 888 VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 888 VLAN0888 active VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2 ---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------ 888 enet 100888 1500 - - - - - 0 0 ================================================================================= On Router B interface FastEthernet1/0.808 description HN-808 interconnect to heyburn via sw1.armplc encapsulation dot1Q 808 ip address 216.24.2.202 255.255.255.252 no cdp enable ! interface FastEthernet1/0.888 description HN-888 interconnect to heyburn via sw1.armplc encapsulation dot1Q 888 ip address 216.24.2.206 255.255.255.252 no cdp enable _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
