Sitting here at Starbucks, using wireless, waiting for the 4th of July
parade.... My brain isn't working too well. The latte wore off hours ago.
But.... it occurs to me that Aironet is bridging, as you know. The routed
network doesn't know when a bridged network goes down. Could you do this
area of the network with all bridging? Could the ISDN link use bridging
also, in other words? I know bridging over ISDN is supported.
The convergence might be so slow, however, that you could pull the e1
interface in about the same timeframe (if you knew to do it though.)
I can't think of any other solution (besides the one you mentioned of
adding a router). It's an interesting design question. Maybe one of the
CCIEs on the list will answer.
Priscilla
At 11:35 AM 7/4/01, KM Reynolds wrote:
>Hi Everyone,
>
>Need you help.
>
>I have a server that is on a remote LAN. To ping the server, the traffic
>goes in the local router(gateway) e0, out e1, to a local Aironet wireless
>bridge, to the remote Aironet wireless bridge, to a switch, to server.
>Works great.
>
>Currently, there is also a link to the remote site, an ISDN, from the local
>router to a remote router. We would like to use this ISDN as a backup to
>wireless connection.
>
>The routers are configured to use EIGRP to route between the wireless, and
>floating routes are set with higher administrative distance so when the
>EIGRP disappears out of the routing table the floating routes route via the
>ISDN.
>
>All works, when the ethernet (e1) is shutdown. When I disconnect the
>wireless at the remote, the ISDN comes up. The problem is, the route to the
>directly connected ethernet LAN is still in the routing table (C
>192.168.30.128 255.255.255.128 is directly connected, Ethernet1). So traffic
>still flows out of e1, and I guess when it reaches the remote wireless
>bridge, it is discarded, that where the connection is down.
>
>Is there anyway around this, is there a way for the e1 to detect the path is
>down or is my only option to place a router and segment the wireless bridge
>link.
>
>Any help would be great.
>
>Thanks
>KM
>_________________________________________________________________________
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________________________
Priscilla Oppenheimer
http://www.priscilla.com
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