Re: Weired question - same DOT1Q tag on two interfaces on same

Thing of each network segment as a VLAN. So in essence you will need 3
VLANs. If your talking about hosting for multiple clients, you should
start to think about VRF's and/or private PVLANS

On Wed, Apr 14, 2010 at 10:05 AM, Radioactive Frog <pbhatkoti_at_gmail.com>wrote:

> Folks,
> Here is what I am trying to do.
>
> all routers are 2911 or 2811 with routed interface (no switching module
> ESW).
>
> R1------------R2----------R3----------R4
>
> Scenario1 - which I always implement:
> -----------------------------------------
> R1 - R2 = VLAN 10 - 10.10.10.1/30
> R2 - R3 = VLAN 20 - 20.20.20.1/30
> R3 - R4 = VLAN 30 - 30.30.30.1/30
>
> Number of VLANs consumed in above scenario:
> R1 = 1 i.e. fast0/0.10
> R2 = 2 i.e. fast0/0.10 and fast0/1.20
> r3 = 2 i.e. fast 0/0.20 and fast0/1.30
> and so on......
>
>
> To reduce the number of VLAN per router and keep the routing intact can we
> do this?
>
> Scenario#2
> R1 - R2 = VLAN 10 - 10.10.10.1/30
> R2 - R3 = VLAN 20 - 20.20.20.1/30
> R3 - R4 = VLAN 30 - 30.30.30.1/30
>
> Number of VLANs consumed in above scenario:
> R1 = 1 i.e. fast0/0.10
> R2 = 1 i.e. fast0/0.10 and fast0/1.10
> r3 = 1 i.e. fast 0/0.10 and fast0/1.10
> and so on......
>
> Did you noticed in above case R2 and R3 are only using 2 VLAN ID.
>
> I'd be interested to hear from you guys if you see any issue in there i.e.
> using vlan id 10 on R2/R3 both fe0/0 and 0/1 interfaces.
>
> Note; No briding, need routing and shoudl be able to use all IOS Feature.
>
>
> The idea is in multi tented environment, we should be able to use vlan ID
> 10
> for a CUSTOMER1 on all the routers. Having vlan10 on R1 and 20 on r2-r3 and
> so on is a bit messy. This approach can also save number of vlan consumed
> and can tanent more customers.
>
> I went thr the Dot1q header but not sure how router treat this on
> interfaces.
>
> http://www.cisco.com/en/US/docs/ios/12_3t/12_3t4/feature/guide/gtunvlan.html
>
> Anyone running this kind of single VLAN in a production environment?
>
> -frog
>
>
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Received on Wed Apr 14 2010 - 19:17:02 ART