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VLAN Trunking on 2821 ISR

ethan.bambock
Level 1
Level 1

Does anyone know if there is anything new regarding vlan trunking on the 2800 Series routers? Is the syntax similar to what's shown below? If you notice in the sample below I have specified vlan 10 to be allowed across the switch port...is it necessary to specify vlans ids, or is there a default action where all vlans are passed through the trunked port?

Any suggestions regarding this would be great. Thanks.

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

... configure other Stuff(TM)

interface FastEthernet 0/2/0

description "The Greatest VLAN"

no ip address

switchport mode trunk

switchport trunk encapsulation dot1q

switchport trunk allowed vlan 10

...configure other interfaces here

interface vlan 10

ip address 10.10.10.1 255.255.255.252

no shutdown

... configure other vlan interfaces here

1 Reply 1

umedryk
Level 5
Level 5

When you configure a trunk port, all VLANs are added to the allowed VLANs list for that trunk. However, you can remove VLANs from the allowed list to prevent traffic for those VLANs from passing over the trunk.The following link has the details.

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat4000/rel6_3/config/e_trunk.htm#39163