[c-nsp] Bridging ethernet to MLPPP

[Putbrese, Trevor A]

I'm not as technical as most of the guys on this list, so don't put too
much stock in my response, but I would of thought what you're trying to
do is not technically feasible on a Cisco router.  

IRB allows you to bridge/switch packets between two routed interfaces.
The issue I see is that the serial interfaces are just that. . . serial.
There's no Ethernet protocol running on the interface, so no MAC
addresses on those pt-to-pt links and therefore no bridging that can be
performed.

I would think you'd instead need some type of layer 2 box that can just
do protocol conversion -- that is, a box that can strip the payload from
the Ethernet frames and wrap it in a TDM header (add all the necessary
padding to adjust for timing on the TDM side of the network) and put it
on the wire.  I think the Anda EtherReach boxes do this.

I could definitely be wrong here, so I'm interested to see what type of
responses you receive.


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Joe Freeman
Sent: Monday, December 27, 2010 10:52 PM
To: Cisco-nsp
Subject: [c-nsp] Bridging ethernet to MLPPP

I've got a situation where a customer is having to relocate from one
facility to another a few  miles away. This customer has a 100Mb metro
ethernet connection at the old location, and can't get it moved for
several
months.

To help them out, we're trying to setup a pair of 3620's that we had
with
wic-1dsu-t1's (4 ea router) to bridge the metro e across a multilink ppp
group and back to an ethernet connection at the new site.

For some reason, I can't get this to work. Here's the config I'm using
on
each side-

bridge irb
bridge 1 protocol ieee

int serial 0/0
encaps ppp
multilink-group 1
int serial 0/1
encaps ppp
multilink-group 1
int serial 1/0
encaps ppp
multilink-group 1
int serial 1/1
encaps ppp
multilink-group 1

int multilink 1
encaps ppp
bridge-group 1

int fa0/0
bridge-group 1


So I figure I'm either missing something simple, or something major,
like
it's just not possible with this hardware. Either way, I'd appreciate
whatever thoughts anyone has.

Thanks-
Joe
_______________________________________________
cisco-nsp mailing list  cisco-nsp at puck.nether.net
https://puck.nether.net/mailman/listinfo/cisco-nsp
archive at http://puck.nether.net/pipermail/cisco-nsp/