RE: [nsp] MC3810 DSL Bridging Problem (IRB)

From: Scott Keoseyan (SAKeoseyan@ixc-comm.com)
Date: Wed Oct 20 1999 - 08:30:27 EDT


I had the same problem with GTE DSL... which terminates on frame-relay and
uses Fujitsu DSL gear. Adjust your MTU to 2048 and this might fix the
problem. I think it is an issue with DSL, and not the frame provisioning,
but I have not come across the real reason why you need the larger MTU size.

Scott

--
Scott Keoseyan (sakeoseyan@ixc-comm.com)
Senior Network Consultant
IXC Communications, Inc.
1881 Campus Commons, Suite 210
Reston, VA  20191 
(703)391-1831 - (FAX)476-5103
http://www.cciepreplab.com 

-----Original Message----- From: Jay Stewart [mailto:cosmo@olywa.net] Sent: Tuesday, October 19, 1999 6:41 PM To: cisco-nsp@puck.nether.net Subject: [nsp] MC3810 DSL Bridging Problem (IRB)

I'm having problems getting IRB to work correctly with COVAD DSL connected PVCs over Frame-Relay. (Configs below)

Everything seems to work fine on these connections - I can ping the customer, simple stuff works, and all downloads in the direction of the customer work, but when they try to FTP stuff upstream, or send an encoded e-mail attachment, their transfers putter out during upload. This is only on the *bridged* COVAD PVC's, not the routed ones (of which we have a dozen or so on the same shared T1).

I'm running 12.0(6) in a MC3810 with 32 MB of RAM. The customers are using FlowPoint 2200 SDSL router/bridge at varying speeds in bridged ADSL mode. Line problems have been eliminated as a problem. Is there a switch I'm not flipping, or something I'm forgetting, or is there an issue with using this type of configuration in a MC3810? I get this problem whether or not I'm using separate sub-interfaces with separate BVI's, or whether I share.

Jay Stewart Vice President Olympia Networking Services - "The Northwest's Premier ISP" http://www.olywa.net

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bridge irb

interface Serial1 description covad DSL Access T1 no ip address no ip directed-broadcast encapsulation frame-relay no ip route-cache no ip mroute-cache no keepalive no fair-queue

interface Serial1.999 multipoint description COVAD bridged Interface no ip directed-broadcast no ip route-cache frame-relay map bridge 44 broadcast IETF frame-relay map bridge 38 broadcast IETF bridge-group 1 bridge-group 1 spanning-disabled

interface BVI1 description Shared Bridged Interface for COVAD DSL. ip address 216.173.209.126 255.255.255.192 no ip directed-broadcast no ip proxy-arp arp timeout 3600 end

bridge 1 protocol ieee bridge 1 route ip



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