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<font face="Helvetica, Arial, sans-serif">Perhaps. I don't know if
you can use it with IP SLA objects though, and the gateway device
may not implement CDP, or may have it turned off - I know I always
try to switch it off on untrusted (customer-facing) interfaces
because it discloses things (e.g. IOS version) that could be used
against you!<br>
<br>
</font>
<div class="moz-cite-prefix">On 05/05/14 16:23, Joshua D'Alton
wrote:<br>
</div>
<blockquote
cite="mid:CAMtDJD+zNzEhQfs7aZE70jqzUxEVCsmAsoh2+4HNFaQ2Fh0FeQ@mail.gmail.com"
type="cite">
<p dir="ltr">seems to me CDP would be used/useful for this? At
least from a l2 perspective which would be the case of outage
99% the time?</p>
<p dir="ltr">sent from android</p>
<div class="gmail_quote">On 05/05/2014 4:15 PM, "Chris Balmain"
<<a moz-do-not-send="true"
href="mailto:chris@team.dcsi.net.au">chris@team.dcsi.net.au</a>>
wrote:<br type="attribution">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF"> <font face="Helvetica,
Arial, sans-serif">Erm... meant to say ARP/ping
reachability verification is *not* used unless you tell it
to...<br>
<br>
</font>
<div>On 05/05/14 16:12, Chris Balmain wrote:<br>
</div>
<blockquote type="cite"> <font face="Helvetica, Arial,
sans-serif"><font face="Helvetica, Arial, sans-serif">T</font>he
route is installed in the FIB if the router has a route
to the gateway itself (e.g. via a connected interface in
up/up status, or recursively via IGP etc)<br>
<br>
ARP/ping reachability verification is used unless you
tell it to (on Cisco via "ip sla" - <a
moz-do-not-send="true"
href="http://www.firewall.cx/cisco-technical-knowledgebase/cisco-routers/813-cisco-router-ipsla-basic.html"
target="_blank">http://www.firewall.cx/cisco-technical-knowledgebase/cisco-routers/813-cisco-router-ipsla-basic.html</a>)<br>
<br>
CB<br>
<br>
</font>
<div>On 05/05/14 15:58, Alex Samad - Yieldbroker wrote:<br>
</div>
<blockquote type="cite">
<pre>Hi
I am looking for some documentation that explains the way cisco behaves.
If I have this
IOS
ip route 0.0.0.0 0.0.0.0 w.x.y.z 230
ip route 0.0.0.0 0.0.0.0 f.g.h.i 240
ip route 0.0.0.0 0.0.0.0 r.s.t.u 250
ASA
route internet 0.0.0.0 0.0.0.0 w.x.y.z 230
route internet 0.0.0.0 0.0.0.0 f.g.h.i 240
route internet 0.0.0.0 0.0.0.0 r.s.t.u 250
this tells me the default gateway used is w.x.y.z, unless that gateway is unavailable or dead..
I am looking at how Cisco decides when a gateway is dead, I found documents on route selection, but nothing that specifically address dead gateways
I presume, and from what I have seen if there is no arp its dead..
Thanks
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