ospf and sub-interfaces [7:38788]

2002-03-19 Thread bergenpeak

I'm looking at an design where there's a hub-spoke network
based on 802.1q.   Specifically, there will be a number of routers
connect back via FE/GE into a central router through an 802.1q
trunked interface.  Each remote router will run OSPF and thus
should form an OSPF adjancency with the central router over its
respective sub-interface.

Any issues or gotchas with this?  I've not gotten a chance to
test this out yet.

Thanks much.




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Re: ospf and sub-interfaces [7:38788]

2002-03-19 Thread Erick B.

Hi,

This shouldn't be a problem. I've done it before. Just
make sure the native VLAN is the same on each 802.1q
connection (ie: switch port and router port connecting
to each other are in same native VLAN). If you have a
newer router IOS you can do a 'encaps dot1q # native'
command. Older IOS's didn't have the native keyword.
If you don't have the IOS with the native keyword you
can put the native VLAN IP on the main interface which
will be native VLAN. 

You might also want to hard-code the trunk to on
instead of auto/desirable and turn channeling off and
hardcode the speed/duplex.

HTH, Erick B.

--- bergenpeak  wrote:
> I'm looking at an design where there's a hub-spoke
> network
> based on 802.1q.   Specifically, there will be a
> number of routers
> connect back via FE/GE into a central router through
> an 802.1q
> trunked interface.  Each remote router will run OSPF
> and thus
> should form an OSPF adjancency with the central
> router over its
> respective sub-interface.
> 
> Any issues or gotchas with this?  I've not gotten a
> chance to
> test this out yet.
> 



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