[c-nsp] 7600 Router Vlan / sub-interface question

[Dave McGaugh]

I don't think enabling descending allocation will fix his problem  
(could be wrong). In my experience, regardless of the allocation  
method used on the box, when you create a VLAN sub-interface, it will  
internally use the same VLAN ID as that configured with the  
"encapsulation dot1q <vlan>" command.

Additionally, it might be worth pointing out that in an earlier  
thread a few months back, having routed VLAN sub-interfaces are not  
supported on many protocols other than MPLS in the 7600.

The VLAN mapping functionality is probably going to get closest to  
what he is looking for.

-Dave

On May 5, 2005, at 1:12 PM, Jeff Hood wrote:

> Try this:
> vlan internal allocation policy descending
>
> Only problem I think is that you have to reboot. We did that on our
> 7609 Sup720 3bxl. Works great...
>
> Jeff Hood
>
>
> On 5/5/05, Jared Mauch <jared at puck.nether.net> wrote:
>
>> On Thu, May 05, 2005 at 08:46:30PM +0100, Colin Whittaker wrote:
>>
>>>
>>> Vlan ids are global to the chassis, so you can't do this.
>>>
>>
>>        well, except in the case of the OSMs, those are full L3
>> linecards and vlans are specific to them, but yes, otherwise vlans
>> are global.
>>
>>        try typing "sh vlan internal"
>>
>>        - jared
>>
>>>
>>> Down side of it being a swouter.
>>>
>>> Colin
>>>
>>> On Thu, May 05, 2005 at 09:37:27PM +0200, Danielsen.Peter  
>>> Christian PED wrote:
>>>
>>>>> Any one, know if it's posible to add the same vlan id on to  
>>>>> diffred
>>>>> sub interface, i get a error when trying,
>>>>> My setup looks like this, one 7609 connectet to to Cisco 3550  
>>>>> switche,
>>>>> alle running Layer3, i need to use the same vlan id on to or  
>>>>> more sub
>>>>> interfaces, all sub interfaces are Layer3 interfaces,
>>>>>
>>>>> My interface configuration on the 7609 is..
>>>>> interface GigabitEthernet3/2
>>>>>  description 3550-S1
>>>>>  no ip address
>>>>>  no ip proxy-arp
>>>>>  spanning-tree portfast trunk
>>>>> !
>>>>> interface GigabitEthernet3/2.2
>>>>>  encapsulation dot1Q 2
>>>>>  ip vrf forwarding VRF00001
>>>>>  ip address 172.31.7.85 255.255.255.252
>>>>>  no ip proxy-arp
>>>>> !
>>>>> interface GigabitEthernet3/2.4
>>>>>  encapsulation dot1Q 4
>>>>>  ip vrf forwarding VRF0002
>>>>>  ip address 172.30.7.85 255.255.255.252
>>>>>  no ip proxy-arp
>>>>> !
>>>>> interface GigabitEthernet3/3
>>>>>  description 3550-S2
>>>>>  no ip address
>>>>>  no ip proxy-arp
>>>>>  spanning-tree portfast trunk
>>>>> !
>>>>> interface GigabitEthernet3/3.2
>>>>>  encapsulation dot1Q 2
>>>>>  ip vrf forwarding VRF00003
>>>>>  ip address 172.32.7.85 255.255.255.252
>>>>>  no ip proxy-arp
>>>>>
>>>>> If i try to add encapsulation dot1Q2 on sub-interface
>>>>> GigabitEthernet3/3.2, i get the following error,
>>>>> 7609(config-subif)#encapsulation dot1Q 2
>>>>> Command rejected: VLAN 2 not available
>>>>> 7609(config-subif)#
>>>>>
>>>>> Any one know how to get this to work !! ...
>>>>>
>>>>> /PED_DK
>>>>>
>>>>
>>>>
>>>>
>>>>
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>>>
>>> --
>>> Colin Whittaker    colin.whittaker at heanet.ie    Tel: +353 1 6609040
>>> HEAnet NOC         noc at heanet.ie                iNOC-DBA:  1213*752
>>> _______________________________________________
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>>
>> --
>> Jared Mauch  | pgp key available via finger from  
>> jared at puck.nether.net
>> clue++;      | http://puck.nether.net/~jared/  My statements are  
>> only mine.
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