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802.1Q VLAN Limitations?

We have two 4006 switches with Sup IV's running as our core LAN connections to older 2924 switches. We run VTP on the Cores, both acting as server mode. When I create a vlan 1100 on the core and an SVI (i.e. int vlan 1100) with an IP, the interface shows up and can be pinged, but the vlan1100 does not propagate to the other core switch nor to the closet switches. Pruning is enabled globally but no vlans are manually pruned on trunks to other switches.

Trying to understand why this vlan will not propagate to the other switches.

Thx

2 REPLIES

Re: 802.1Q VLAN Limitations?

check the trunk link between access 2924 and core 4006 switches.

check if trunk ports between access and core switches allow VLAN 1100.

make sure VTP domain is same between 2924 and 4006 switches.

if VTP authentication is set, make sure you have correct password configured on all the switches.

hope to help ... rate if it does ....

Cisco Employee

Re: 802.1Q VLAN Limitations?

Hi Friend,

1100 is not a normal range VLAN and is an extended range VLAN.

Normal VLANs are propagated to other switches in the network when you use the VLAN Trunking Protocol (VTP). The extended-range VLANs are not propagated, so you must configure extended-range VLANs manually on each network device.

Have a look at this link

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat4000/12_2_25/conf/vlans.htm#wp1038758

HTH

Ankur

*Pls rate helpfull post

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