From: Michael L. Williams (MichaelWilliams@swbell.net)
Date: Fri Apr 18 2003 - 23:13:50 GMT-3
Hello all. Hopefully I'll get through this frame stuff and move on to
asking silly questions about another technology soon =)
I've ready many places (Caslow, this list, etc) that if you have learned
a mapping dynamically through inverse ARP, then you perform a
frame-relay map command, that it disables inverse ARP for that protocol
for that DLCI and that if you save and reboot that router, anything
learned through inverse ARP will be lost.
This make sense to me. However, I'm doing this lab, and I'd learned two
IPs through mapping as seen here:
R6#sh frame map
Serial1 (up): ip 150.50.100.2 dlci 601(0x259,0x9490), dynamic,
broadcast,, status defined, active
However, I then added a map command and the frame map showed the
following:
R6(config)#int s1
R6(config-if)#frame-relay map ip 150.50.100.6 601
R6(config-if)#^Z
R6#sh frame map
Serial1 (up): ip 150.50.100.2 dlci 601(0x259,0x9490), dynamic,
broadcast,, status defined, active
Serial1 (up): ip 150.50.100.6 dlci 601(0x259,0x9490), static,
CISCO, status defined, active
So now I've mapped an IP (the local IP, so I can ping the local FR
interface) to DLCI 601.
However, I did a 'wr mem' and reload and this is what I see:
R6#sh frame map
Serial1 (up): ip 150.50.100.2 dlci 601(0x259,0x9490), dynamic,
broadcast,, status defined, active
Serial1 (up): ip 150.50.100.6 dlci 601(0x259,0x9490), static,
CISCO, status defined, active
WTF?!?! I thought once I mapped an IP to that DLCI that a reload would
clear the dynamic mapping and Inverse Arp would be disabled?!?! Does
this only apply if you map a remote IP to the DLCI (i.e. does it
recognize that this IP is local and so it doesn't disable inverse arp)?
My head hurts, and I'm barely started =)
Mike W.
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