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

Dave McGaugh dmcgaugh at cac.washington.edu
Fri May 6 12:28:00 EDT 2005 

I believe the VLAN mapping functionality is limited only to  
switchports. So no, it wouldn't be available on sub-interfaces since  
sub-interfaces are not permitted on switchports.

-Dave

On May 5, 2005, at 9:36 PM, Ram S wrote:

> Is vlan mapping functionality available on
> sub-interfaces ?
>
> Thanks,
> Ram.
>
> --- Dave McGaugh <dmcgaugh at cac.washington.edu> wrote:
>
>
>> 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
>>>>>
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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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