[cisco-bba] About converting from IRB to RBE

Mark E. Mallett mem at mv.mv.com
Tue Aug 19 13:24:08 EDT 2003

On Fri, Aug 15, 2003 at 03:18:56PM -0700, Siva Valliappan wrote:
> > It also occured to me that I could use the "ip dhcp database"
> > facility-- I could easily hand-construct a dhcp cache file that would
> > be loaded into the router upon reload.  However, that would involve
> > getting the information out of the IRB configuration to populate that
> > fake database, information that would include VPI/VCI for each
> > installed ARP entry, and again I have run into a wall trying to find
> > that.
> >
> yah.  :(

It finally dawned on me that I could get the required info from "show
bridge verbose" (MAC address and interface) and "show ip arp" (MAC
address and IP address) and simply do a join to get IP address and
interface, then hand-craft a dhcp cache file.  The remaining gotcha
was that I could not find a way to force the cisco to re-read the dhcp
cache file other than by rebooting.  (One also has to consider the
lease expiration times but that's either just another join or some
other control on the lease times).  At any rate, although it did
require a reboot, that process worked fairly well.


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