[c-nsp] acl on bvi in ios xr (9k) 4.1.2

[adam vitkovsky]

Regarding my second suggestion,
It's certainly more complex than BVI
It's used in metro aggregation rings running MPLS
On ring-access boxes you can bridge the traffic from ports in bridge-domain
into PWs running to ring-aggregation boxes where the PWs are terminated -on
these you can bridge the PWs traffic into qinq/802.1ad/(802.1ah) trunks
running to L3 boxes (PEs)  

I'm also missing a virtual outgoing interface on which I could terminate the
L2 PW and bridge the traffic from this virtual interface onto a L3 interface
all on a single box


adam
-----Original Message-----
From: Gert Doering [mailto:gert at greenie.muc.de] 
Sent: Monday, July 23, 2012 11:20 AM
To: adam vitkovsky
Cc: 'Gert Doering'; '?ukasz Bromirski'; cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] acl on bvi in ios xr (9k) 4.1.2

Hi,

On Mon, Jul 23, 2012 at 10:14:10AM +0200, adam vitkovsky wrote:
> >"one router, two different switches, both switches are standalone and 
> >have
> no multi-chassis capabilities".
> If there's the same VLAN  running of the two switches you could 
> terminate it on two separate L3 sub-interfaces on the ASR9K /breaking 
> the VLAN subnet in two -loosing 4 addresses

Which give you twice the amount of single-point-of-failure, instead of the
desired goal: redundant links to the same L2 network.

> Or instead of the BVI you could use a PW to aggregate the L2 traffic 
> form the disjoint VLAN and terminate the PW at ASR9K running L3 for 
> the aggregation ring

I'm not sure I understand that, but it doesn't sound any simpler than a
BVI...  (but as long as VPLS is mentioned, it must be great)

> Or you can use the already mentioned L2 switch to aggregate the VLANS 
> from the two switches and connect it via trunk to ASR9K

There's no "single L2 switch".  Which is the point of the excercise.

gert 

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