From: Raphael Gallegos (raphaeljg@xxxxxxxxxxx)
Date: Mon Sep 03 2001 - 02:21:16 GMT-3
Try the "preference" command under your pots (Or vofr/vatm) statements, I
believe default is 1, and the lower is taken first, so just set preference
to 2 for the one you want as a backup.
"ip precedence" is definitely serving a different purpose: Router assigns a
higher priority within the packet.
Raphael
>From: Michael Wong <Michael.Wong@nec.com.au>
>Reply-To: Michael Wong <Michael.Wong@nec.com.au>
>To: "'Nicholas Jaksec'" <jaksec@lucent.com>, CCIE <ccielab@groupstudy.com>
>Subject: RE: VOI P Question
>Date: Mon, 3 Sep 2001 11:15:00 +1000
>
>Be careful here. I haven't actually done what you've shown but I'm sure it
>will cause some issues. 2 Dial peers to a single destination is bound to
>cause some problems when the router decides to use the dial peer. My gut
>tells me that it will use the 1st dial peer configured and won't even look
>at the second one ... not 100% sure though.
>
>If I understand you correctly, you have got 2 paths (subnets) to the 1
>destination number. Precedence values do not tell the router which dial
>peer to use, it is used to determine which traffic should be forwarded
>first when using a queuing mechanism such as WFQ or LLQ. The precedence
>command under the dial-peer basically flags the packets from the dial-peer
>as whatever precedence value set, to allow the queuing mechanism to act on
>it.
>
>In an implementation such as this, I would have one dial peer pointing to
>the end destination, and then alter the routing protocol to determine which
>is your preferred path. Maybe modify metrics or use policy routing.
>
>Good luck, let me know how you go ......
>
>MW :)
>
>
>
>-----Original Message-----
>From: Nicholas Jaksec [mailto:jaksec@lucent.com]
>Sent: Monday, 3 September 2001 9:31 am
>To: CCIE
>Subject: VOI P Question
>
>
>Can the "IP Precedence" command determine which Dial Peer statement has
>higher priority to call the same phone #, example:
>
>"R1" has two IP subnets in its routing table (10.1.1.0 & 11.1.1.0) to reach
>the same Phone # "3002" on "R2" but I only want traffic to use the one
>subnet (10.1.1.2) at all times. Can IP Precedence do this by making the
>values different, if so which value (5 or 6) has the higher priority. I am
>not sure if higher values have the higher priority or the lower values.
>
>
> "R1"
>
>dial-peer voice 1 voip
>destination-pattern 3002
>session target ipv4:10.1.1.2
>ip precedence 5
>!
>dial-peer voice 2 voip
>destination-pattern 3002
>session target ipv4:11.1.1.2
>ip precedence 6
>
>
> "R2"
>
>dial-peer voice 1 pots
>destination-pattern 3002
>port 1/0/0
>
>
>
>
>********************************************
>Nicholas R. Jaksec, CCNP, CCDP, MCSE+I, CNA
>Network Systems Engineer
>Lucent Worldwide Services
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