ME 3400

Aug 05, 2008 3 Replies

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die.spam 17 years ago

When Im configuring this 12G switch and I add a vlan I get no spanning tree instance for it? I thought perhaps it was because it had no ethernet connections up but even when bringing an interface up I still get no stp instance.

heres what I have done:

vlan 123 name test

interface GigabitEthernet0/13 description trunk port port-type nni switchport trunk allowed vlan 2-4094 switchport mode trunk udld port

interface GigabitEthernet0/1 switchport access vlan 123 media-type rj45 speed 100 duplex full

spanning-tree mode rapid-pvst spanning-tree extend system-id spanning-tree vlan 123 priority 0

switch#sh span vlan 50

Spanning tree instance(s) for vlan 50 does not exist.

switch#sh vlan br

VLAN Name Status Ports

---- -------------------------------- ---------

-------------------------------

1 default active Gi0/4, Gi0/5, Gi0/6, Gi0/7 Gi0/8, Gi0/9, Gi0/10, Gi0/11 Gi0/12, Gi0/13, Gi0/14, Gi0/15 Gi0/16
123 test active Gi0/1
1002 fddi-default act/unsup
1003 token-ring-default act/unsup
1004 fddinet-default act/unsup
1005 trnet-default act/unsup

any ideas? I have tried shutting and no shutting the vlan etc but cant get spanning tree to work?

Flamer.

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Brian V 17 years ago

Uhm, because you created a VLAN 123 and are trying to look at VLAN 50 ?

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die.spam 17 years ago

s =A0 =A0Ports

ive =A0 =A0Gi0/4, Gi0/5, Gi0/6,

=A0 =A0 =A0 =A0 =A0 =A0Gi0/8, Gi0/9, Gi0/10,

=A0 =A0 =A0 =A0 =A0 =A0Gi0/12, Gi0/13,

=A0 =A0 =A0 =A0 =A0 =A0Gi0/16

tive =A0 =A0Gi0/1

ah sorry, i was looking at the right vlan, i had changed numbers around to not show anything sensitive (obviously didnt change all of them), but thank you for pointing that out

it should read:

switch#sh span vlan 123

Spanning tree instance(s) for vlan 123 does not exist.

My real question should really be, if i create a vlan while there are no active network connections on the switch is a stp instance created?

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die.spam 17 years ago

e =A0 =A0Gi0/4, Gi0/5, Gi0/6,

=A0 =A0 =A0 =A0 =A0 =A0 Gi0/8, Gi0/9, Gi0/10,

=A0 =A0 =A0 =A0 =A0 =A0 Gi0/12, Gi0/13,

=A0 =A0 =A0 =A0 =A0 =A0 Gi0/16

ve =A0 =A0Gi0/1

Ok I have figured it out, it allows you to tag one port as "nni" this port must be up/up for spanning tree to start its thing.. (I had set nni on an optical interface and was testing it by plugging the trunk into a copper interface)

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