RIP & DDR

From: rjonathan@hotpop.com
Date: Mon Oct 14 2002 - 23:05:43 GMT-3

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Dear Group,

In the CCO,
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/dial
ts_c/dtsprt5/dcdhwddr.htm#xtocid2946516

It stated that, when you configured DDR, at minimum we "must"
disable validation of source address.

What is the mechanism of validating source-ip address ?
Is it done by validating the reachability of the source ip address ?
Or is it done by comparing the source ip address with the subnet where the
routing updates come from ?
Or may be by other methods ?

And why should we disable validation of source address when configuring DDR
?

I'm a bit confused and can't find detailed explanation on this thing.

Appreciate if anyone can shed some light of point me to good resource.

Thanks in advance.

Regards,
Ronny

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