<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Verdana; font-size: 10pt; color: #000000'>I'm thinking in my situation this might not work. Because we're connected via an intermediary switch, if the upstream core router goes down, the interface will still be up.<br><br><span><br><span name="x"></span>---<br>Lelio Fulgenzi, B.A.<br>Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1<br>(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)<br>^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^<br>Cooking with unix is easy. You just sed it and forget it. <br> - LFJ (with apologies to Mr. Popeil)<br><span name="x"></span><br></span><br><hr id="zwchr"><b>From: </b>"Lelio Fulgenzi" <lelio@uoguelph.ca><br><b>To: </b>"James Brown" <James.Brown@barclayswealth.com><br><b>Cc: </b>cisco-voip@puck.nether.net<br><b>Sent: </b>Thursday, October 14, 2010 12:29:22 PM<br><b>Subject: </b>Re: [cisco-voip] asymetrical routing and voice - thoughts? requirements?<br><br><style>p { margin: 0; }</style><div style="font-family: Verdana; font-size: 10pt; color: rgb(0, 0, 0);">someone else has mentioned the backup interface command. it didn't click until you put it in the config below, however.<br><br>so essentially, on the VG224, i use the backup interface command and one of the interfaces will more than likely "go down" ? <br><br>this should keep the upstream router from using that second interface correcT?<br><br><br><span><br><span></span>---<br>Lelio Fulgenzi, B.A.<br>Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1<br>(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)<br>^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^<br>Cooking with unix is easy. You just sed it and forget it. <br> - LFJ (with apologies to Mr. Popeil)<br><span></span><br></span><br><hr id="zwchr"><b>From: </b>"James Brown" <James.Brown@barclayswealth.com><br><b>To: </b>lelio@uoguelph.ca<br><b>Cc: </b>cisco-voip@puck.nether.net<br><b>Sent: </b>Thursday, October 14, 2010 12:25:57 PM<br><b>Subject: </b>RE: [cisco-voip] asymetrical routing and voice - thoughts? requirements?<br><br>
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<div dir="ltr" align="left"><font color="#0000ff" face="Arial" size="2">Have you
considered the backup interface command?</font></div>
<div><font color="#0000ff" face="Arial" size="2"></font> </div>
<div dir="ltr" align="left"><font color="#0000ff" face="Arial" size="2">!<br>int
fa0/0<br> backup interface Fast Ethernet 1/0<br>!</font></div>
<div dir="ltr" align="left"><font color="#0000ff" face="Arial" size="2"></font> </div>
<div dir="ltr" align="left"><font face="Arial"><font color="#0000ff"><font size="2"><span class="841102416-14102010">The only alternative I can think of
</span>might <span class="841102416-14102010">involve attaching a route-map,
but then you have to consider changing the metric of both inbound and outbound
routes on a per-interface basis.</span></font></font></font></div>
<div dir="ltr" align="left"><font face="Arial"><font color="#0000ff"><font size="2"><span class="841102416-14102010"></span></font></font></font> </div>
<div dir="ltr" align="left"><font face="Arial"><font color="#0000ff"><font size="2"><span class="841102416-14102010">Regards</span></font></font></font></div>
<div dir="ltr" align="left"><font face="Arial"><font color="#0000ff"><font size="2"><span class="841102416-14102010"></span></font></font></font> </div>
<div dir="ltr" align="left"><font face="Arial"><font color="#0000ff"><font size="2"><span class="841102416-14102010">James.</span></font></font></font></div><br>
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<hr>
<font face="Tahoma" size="2"><b>From:</b> cisco-voip-bounces@puck.nether.net
[mailto:cisco-voip-bounces@puck.nether.net] <b>On Behalf Of </b>Lelio
Fulgenzi<br><b>Sent:</b> 13 October 2010 21:48<br><b>To:</b> Wes
Sisk<br><b>Cc:</b> voyp list<br><b>Subject:</b> Re: [cisco-voip] asymetrical
routing and voice - thoughts? requirements?<br></font><br></div>
<div></div>
<div style="font-size: 10pt; color: rgb(0, 0, 0); font-family: Verdana;">a very
rudimentary diagram follows.<br><br>Essentially, any traffic that hits core-1
will go to the VG224:fa0/0 interface and any traffic that hits core-2 will go to
the VG224:fa0/1 interface. That's because an interlink between the two cores
(not pictured, sorry) increases the distance to the other side.<br><br>We are
using intermediary switches because there are not enough ports on the core
switches/routers.<br><br>The links are essentially layer three routed
point-to-point links (through a layer two interface).<br><br>The default route
is sent to the VG224 using eigrp summary command and they are equally weighted.
So traffic outbound from the VG224 will be random across both links. I can
change this by using a delay command easily to prefer one route over the other.
But again, this will affect outbound traffic only.<br><br>I guess there's a
difference between equal routes (which appear on the VG224) which means traffic
to the same destination will traverse both links and with an asymetrical route
which I understand as traffic to a device goes out one link and comes back on
another. However, I can't guarantee that traffic from a device on the network
will always choose core-1 or core-2, so it may be a case of inbound traffic
coming in on either interface as well.<img src="cid:841102416@14102010-13EF"><span><br><br><span></span>---<br>Lelio Fulgenzi, B.A.<br>Senior Analyst (CCS) * University
of Guelph * Guelph, Ontario N1G 2W1<br>(519) 824-4120 x56354 (519) 767-1060 FAX
(JNHN)<br>^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^<br>Cooking
with unix is easy. You just sed it and forget it. <br>
- LFJ (with apologies to Mr. Popeil)<br><span></span><br></span><br>
<hr id="zwchr">
<b>From: </b>"Wes Sisk" <wsisk@cisco.com><br><b>To: </b>"Lelio Fulgenzi"
<lelio@uoguelph.ca><br><b>Cc: </b>"voyp list"
<cisco-voip@puck.nether.net><br><b>Sent: </b>Wednesday, October 13, 2010
4:29:18 PM<br><b>Subject: </b>Re: [cisco-voip] asymetrical routing and voice -
thoughts? requirements?<br><br>We're missing a bit of information like how you
got asymmetrical routing to the router interfaces. Care to
share?<br><br>Otherwise, in theoretical discussion, my peers agree that router
will service traffic for any locally configured IP from any network
interface.<br><br>There are the classic issues of binding VOIP protocols to
interfaces with routable IP addresses but that is a separate
issue.<br><br>/Wes<br><br>Lelio Fulgenzi wrote:
<blockquote style="border: medium none; padding-right: 0px ! important; padding-left: 0px ! important; margin-left: 0px ! important; margin-right: 0px ! important;" cite="mid:1395946369.442430.1286998822419.JavaMail.root@simcoe.cs.uoguelph.ca">
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<div style="font-size: 10pt; color: rgb(0, 0, 0); font-family: Verdana;">OK, not
sure if this has been discussed before, but I just tried to get all my voice
through one interface of my VG224 and in doing so, I lost the route to the
other interface. We did this by using the delay command. Anything else I've
been told, will take significant time to deploy.<br><br>So the question is, in
the case of end devices (mainly gateways) that have two uplinks, how important
is it to ensure that only one side is always used? Is it a requirement or is
it a nice to have? I'd rather not be introducing delay statements if I don't
have to.<br><br>Or is it all just to make troubleshooting
easier?<br><span><br><span></span>---<br>Lelio Fulgenzi, B.A.<br>Senior
Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1<br>(519)
824-4120 x56354 (519) 767-1060 FAX
(JNHN)<br>^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^<br>Cooking
with unix is easy. You just sed it and forget it. <br>
- LFJ (with apologies to Mr.
Popeil)<br><span></span><br></span><br></div><pre><hr width="90%" size="4">
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