From: Peng Li (lipeng@xxxxxxxxxx)
Date: Tue Aug 21 2001 - 23:18:53 GMT-3
Hi,
According to my observation in lab for OSPF DDR, there r three major ways.
1. Physical BAckup interface Dialer0. no passive-inter dialer0, Ospf pakt shoul
d be interesting to bring up the link . u can use DC for this one, some times l
ater the line down. if there's LSA content change(add/delet interface), these b
ring up the link. Data pkt can always follow the correct RT to dialer0. DC here
suppress hello and LSA refesh(every 30min)
2. Dialerwatch any route even the route of the S0's link. No passive dialer 0 b
ut you can deny Ospf pkt as interesting pkt. As long as the link up, they will
fast exchange hello and exhange DBD to establish RT to make sure the data go th
rough. If DC used here, in my lab, the link seems never come down, I don't know
why?
3. Floating. Usually passive dialer0 and Ospf pkt not interesting so that becau
se we rely on static route at bothe end. not necessary for user of DC.
Just my little idea. Hope it helps somewhere.
Peng
Lab on Oct. 10
----- Original Message -----
From: "SALMON, MARK (SBMS)" <MARK.SALMON@cingular.com>
To: <ccielab@groupstudy.com>
Sent: Tuesday, August 21, 2001 8:32 PM
Subject: Demand Circuit revisited
> My dilemma, I have OSPF demand circuit configured on ISDN/Dialer interfaces.
> I have blocked OSPF multicasts to prevent dialer bouncing. The 64k question
> is how to get the demand circuit up so full adjacency is reached while
> preventing OSPF LSPs/LSAs from causing the like to bounce up and down. On
> both sides redistributed routes or the link to OSPF backbone can cause
> changes in the LSDB to cause flooding over the ISDN line.
>
> One option I see is to use dialer watch while maintaining the OSPF multicast
> filtering access list. Any thoughts? Anyone have any other ideas (assume
> that snapshot routing for IPX is NOT configured)
>
> Mark Salmon
> Sr. WAN Engineer Great Lakes Region
> Cingular Wireless
> 2000 Ameritech Center Drive 3F07B
> Hoffman Estates IL 60195
> Voice: (847)765-3999
> Pager: (847)992-0458
> Email: mark.salmon@cingular.com
> **Please read:http://www.groupstudy.com/list/posting.html
**Please read:http://www.groupstudy.com/list/posting.html
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:31:55 GMT-3