From: Troy Levin (troylevin@hotmail.com)
Date: Wed May 25 2005 - 17:34:57 GMT-3
Gladston.
Is your CAT1 port connected to R7 configured for vlan4? If so then your
traffic from R1 fa0/0.4 will be received by CAT1 as untagged and will be
processed according to tables of SPT instance 4 which includes the port to
R7.
HTH,
Troy
----- Original Message -----
From: <gladston@br.ibm.com>
To: <ccielab@groupstudy.com>
Sent: Wednesday, May 25, 2005 1:25 PM
Subject: Help with Native Vlan
> If configuring native vlan other than 1, connectivity is lost.
>
> Any idea?
> version is 12.2(15)T5 for router 2600 and 12.1(20)EA1a for 3550
>
> As it is an unexpected behavior I tested on another router and 3550. (but
> the IOS is the same).
>
> R1----trunk----CAT1---vlan4--R7
>
> Rack2R4#sh run int e 0/0.4
> Building configuration...
>
> Current configuration : 650 bytes
> !
> interface Ethernet0/0.4
> encapsulation dot1Q 4 native
> ip address 142.20.44.4 255.255.255.0
> ip access-group 150 in
> ip directed-broadcast
> ip multicast helper-map broadcast 229.1.1.1 110
> rate-limit input access-group 121 512000 64000 96000 conform-action
> continue exceed-action
> drop
> rate-limit input access-group 122 64000 8000 12000 conform-action transmit
> exceed-action dr
> op
> rate-limit input access-group 123 32000 4000 6000 conform-action transmit
> exceed-action dro
> p
> no ip mroute-cache
> ip policy route-map Local-traffic
> ntp multicast 229.2.2.2
> ipv6 address 2001:1:1:4::4/64
> ipv6 address FEC0:2E3D:5B7C:4::4/64
> ipv6 nd suppress-ra
> end
>
> Rack2R4#
> Rack2R4#sh vlan
>
> Virtual LAN ID: 1 (IEEE 802.1Q Encapsulation)
>
> vLAN Trunk Interface: Ethernet0/0
>
> Protocols Configured: Address: Received:
> Transmitted:
>
> Virtual LAN ID: 4 (IEEE 802.1Q Encapsulation)
>
> vLAN Trunk Interface: Ethernet0/0.4
>
> This is configured as native Vlan for the following interface(s) :
> Ethernet0/0
>
> Protocols Configured: Address: Received:
> Transmitted:
> IP 142.20.44.4 37
> 90
>
> Rack2R4#
>
>
> Rack2CAT1#sh run int fa 0/4
> Building configuration...
>
> Current configuration : 203 bytes
> !
> interface FastEthernet0/4
> switchport trunk encapsulation dot1q
> switchport trunk native vlan 4
> switchport mode trunk
> switchport nonegotiate
> mls qos trust ip-precedence
> spanning-tree portfast
> end
>
> Rack2CAT1#sh int fa 0/4 sw
> Name: Fa0/4
> Switchport: Enabled
> Administrative Mode: trunk
> Operational Mode: trunk
> Administrative Trunking Encapsulation: dot1q
> Operational Trunking Encapsulation: dot1q
> Negotiation of Trunking: Off
> Access Mode VLAN: 1 (default)
> Trunking Native Mode VLAN: 4 (VLAN0004)
> Voice VLAN: none
> Administrative private-vlan host-association: none
> Administrative private-vlan mapping: none
> Administrative private-vlan trunk native VLAN: none
> Administrative private-vlan trunk encapsulation: dot1q
> Administrative private-vlan trunk normal VLANs: none
> Administrative private-vlan trunk private VLANs: none
> Operational private-vlan: none
> Trunking VLANs Enabled: ALL
> Pruning VLANs Enabled: 2-1001
> Capture Mode Disabled
> Capture VLANs Allowed: ALL
> Protected: false
> Unknown unicast blocked: disabled
> Unknown multicast blocked: disabled
> Appliance trust: none
>
> Rack2R4(config-subif)#do pi 142.20.44.7
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 142.20.44.7, timeout is 2 seconds:
> ..
>
>
> If native vlan is default, works fine:
>
> Rack2R4(config-subif)# encapsulation dot1Q 4
>
> Rack2CAT1(config-if)#sw tr na v 1
>
> Rack2R4(config-subif)#do pi 142.20.44.7
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 142.20.44.7, timeout is 2 seconds:
> !!!!!
>
> This is the network:
>
> R1----trunk----CAT1---vlan4--R7
>
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