[c-nsp] backup quandry
spork at inch.com
Wed Oct 20 17:13:39 EDT 2004
On Wed, 20 Oct 2004, Josh Duffek wrote:
That looks interesting, but I won't be going to 12.3 anytime soon on our
> josh duffek network engineer
> consultantjd16 at ridemetro.org
> desk: 713-739-4849
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> > -----Original Message-----
> > From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> > bounces at puck.nether.net] On Behalf Of Charles Sprickman
> > Sent: Wednesday, October 20, 2004 3:49 PM
> > To: cisco-nsp at puck.nether.net
> > Subject: [c-nsp] backup quandry
> > Hello,
> > I've been trying to come up with a decent plan to offer backup
> circuits to
> > customers that works well. We have something of an odd environment
> > and most of the solutions I've run through fall short in one way or
> > another.
> > This is a cheap-o backup solution. The scenario is that the client
> has a
> > Covad "Telextend" T1 with the backup line being a Covad SDSL. I'm
> > that this offers no protection against Covad going wonky. We
> > see that most of our client outages are due to Verizon mucking about
> > things, so it actually works quite well.
> > On the client side we're using Netopia gear and it handles cutting
> > the outbound traffic well.
> > To handle routing the client LAN block to SDSL and ADSL circuits, I
> > OAM management on the pvcs and add two static routes to the interfaces
> > (one with lower priority). If one of the circuits fails, the route to
> > that pvc gets yanked as OAM lets us get interface up/down status.
> > The problem is with the "T1" circuits. Covad brings these into T1
> > in their DSLAMs and the does a frame<->ATM translation there. Sadly
> > don't configure the DSLAM to handle any of the ATM OAM stuff for these
> > circuits, so from my router I have no way of getting the status of the
> > circuit.
> > First off, any suggestions for the above scenario? I need some way to
> > determine if the T1 is up or not, but since it's a virtual circuit and
> > Covad does not support the standard signalling, I don't think there's
> > anything I can do there.
> > Second question, Covad has recently approved the Cisco 17xx series
> > for the Telextend service. With one of those in place, I could run
> > over the T1 and put the SDSL router in bridge mode and also run OSPF
> > that link. The only problem there is that the T1 is a 1.5 Mb/s line
> > the SDSL backup link is generally going to be a lower speed link so I
> > don't want to "balance" the two lines, I want the SDSL to only be used
> > the T1 is down. What other options am I missing to make this happen?
> > open to all sorts of nutty hackish ideas...
> > Thanks,
> > Charles
> > --
> > Charles Sprickman
> > spork at inch.com
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