[c-nsp] unnumbered SVI on 6500/sup720

[Anton Kapela]

Where I've used unnumbered svi, it's usually in places where I can
afford 5 to 10 minute leases; on the rare occasion a box blows up,
it's only an average of half the renewal countdown before folks are
re-entered into the fib.

You could, perhaps, bridge the gap by using "connected host arp
polling" after reload, perhaps applied & shortly afterward removed by
an EEM script...

http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/31sga/configuration/guide/unnumber.html

Dirty, for sure -- and seems to break the whole "must dhcp before
working" benefit -- but could reduce the outage duration, and of
course is entirely local, independent of dhcp state upload having
previously succeeded.

-Tk

On Apr 27, 2011, at 9:13 AM, Phil Mayers <p.mayers at imperial.ac.uk> wrote:

> On 27/04/11 14:05, Tóth András wrote:
>> For the relay database, how about 'ip dhcp database' ?
>> http://www.cisco.com/en/US/docs/ios/12_3/ipaddr/command/reference/ip1_i1g.html#wp1080731
>>
>> The DHCP relay agent can save route information to the same database
>> agents to ensure recovery after reloads.
>
> That does seem to work, though it was a bit flaky when I was setting it up; it seems easy to make the box blow away a database at a remote URL, and the lack of an "upload now" command is very tedious.
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