[c-nsp] What is wrong with this config? (nat load sharing)

Rodney Dunn rodunn at cisco.com
Tue Sep 21 21:34:27 EDT 2004


Pointing the route at the interface when
it's Serial point to point is ok because
the mac header rewrite programmed for the
adjacency is the same.

Rodney

On Tue, Sep 21, 2004 at 07:05:33PM -0500, Brian Feeny wrote:
> 
> On Sep 21, 2004, at 6:55 PM, Bruce Pinsky wrote:
> >
> > Look in the archives for the complete discussion of switching paths and
> > load sharing or contact me privately and I'll forward his post to you.
> >
> 
> 
> Bruce,
> 
> Thanks for taking the time to explain that.  I was not aware that the 
> CEF src/dst coin toss was
> deterministic, thats very good for this setup.
> 
> > | ip route 0.0.0.0 0.0.0.0 Serial0
> > | ip route 0.0.0.0 0.0.0.0 Serial1.1
> > | ip route 207.254.192.0 255.255.224.0 Serial0
> > | !
> >
> >
> > Pointing to interfaces is generally discouraged since it causes the 
> > router
> > to want to ARP.  You should point at next hop IP addresses.
> >
> 
> I agree, but on non-broadcast, point to point interface, there is no 
> arp done, since their is only one path for the packet to take, what 
> goes in one end, must come out the other.  The reason we next-hop to 
> interfaces, is so that we can move the customer around without having 
> to access their router.  Once again, I don't believe setting next-hop 
> to a PtP serial interface causes the arp storm you speak of, but please 
> correct me if I am wrong.  I have seen people next-hop to e0 and the 
> like on small, memory starved routers, and its not pretty.
> 
> > - --
> > =========
> > bep
> >
> > -----BEGIN PGP SIGNATURE-----
> > Version: GnuPG v1.2.2 (MingW32)
> >
> > iD8DBQFBUL9zE1XcgMgrtyYRAmRDAKDmAHdpEQkECMyW7bTNZRPSfGCTMACgti52
> > 9hSyK/vlseG0ZcECXwp4d1Y=
> > =WI4A
> > -----END PGP SIGNATURE-----
> >
> ---------------------------------------------
> Brian Feeny, CCIE #8036, CISSP
> Network Engineer
> ShreveNet Inc.
> 



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