From: Kenneth Wygand (KWygand@customonline.com)
Date: Sat Jul 17 2004 - 19:23:05 GMT-3
Mike,
Without specifying the "ip default-gateway", your 3550 will default to using proxy-arp to resolve your IP addresses to MAC addresses. If your attached router (on the VLAN where your switch's IP address is) supports proxy-arp, it will resolve and your ping will succeed.
You should have entries if you do a "show arp" when using proxy-arp, but I don't believe those entries will exist when crossing VLANs if you have a default gateway configured (just your default gateway will be in your local arp table).
If you can, try it out both ways and post your outputs! :)
Hope this helps,
Ken
________________________________
From: nobody@groupstudy.com on behalf of Mike Calhoon
Sent: Sat 7/17/2004 6:18 PM
To: 'Lord, Chris'; ccielab@groupstudy.com
Subject: RE: 3550 COnnectivity
Chris,
I have wondered the same thing lately. I have found that as long as the
rest of my routers have the route to the VLAN installed, I can ping the ip
on the switch without having to add "ip default-gateway", ip routing, or
anything else to it. So full connectivity is being reached, but I am
wondering if I should be adding "ip default-gateway" or anything extra to
the switch.
Thanks,
Mike
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Lord, Chris
Sent: Saturday, July 17, 2004 5:03 PM
To: ccielab@groupstudy.com
Subject: 3550 COnnectivity
Please could I ask for some opinions.......
A lot of practice lab scenarios state standard assumptions such as "do not
use static or default routes on any router, etc" and "full connectivity must
be attained, etc". Suppose we met this in the real lab, my question is
this... if one of the switches has a vlan interface with an ip address
assigned to it then I assume the pod should be able to ping it and
vica-versa. If the switch is not running an IGP, is the use of "ip
default-gateway" permissible or does this break the rules?
If you can't use "ip default-gateway" do you think configuring irdp on the
attached router in the switch's management vlan would be a good alternative?
thx in anticipation,
Chris.
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