From: Volkov, Dmitry (Toronto - BCE) (dmitry_volkov@ca.ml.com)
Date: Tue Sep 03 2002 - 08:34:02 GMT-3
Sean,
>
> Dmitry,
>
> What you thought is still true, that is a router will source
> packets from IP of interface closest to destination.
> What happens here is, when you ping loopbacks on R12 from R9,
> neither eth0 nor ser0 is closer to the
> destinations (7.7.7.7 or 160.160.160.160),
Right, but we have "default" next-hop configured in route-map and
Serial on R9 is closest to next-hop.. Why it wouldn't source from there ? ;)
You can say - this logic is by design. Ok, I'm just wondering what is logic
(sourcing packets) exactly ?
> by default, IOS sources packets from LAN interfaces.
I would add the following: It sources from LAN interfaces with lowest IP.
If there are no LAN interfaces , it sources from Loopback with lowest IP.
If there are no loopbacks or ethernet, but several Serial interfaces
it sources from serial closest to destination.
Do You know why ? and where this behavior (dependance on int type/IP)
described ??
> Then local policy routing kicks in and sends it on to the default
> next hop at 50.100.1.12 on R12's ser0. What really fails the pings is
> because R12 does not have a return route to R9's eth0 network.
Yes, I understand this.
Thanks You,
Dmitry
> - Sean Liu
>
> CCIE, CCNP, CCDP, CCSE,
> AIX-CATE, CNE, MCSE+I
>
> Think Tank Systems, LLC
>
>
>
>
>
> |--------+------------------------->
> | | "Volkov, Dmitry|
> | | (Toronto - |
> | | BCE)" |
> | | <dmitry_volkov@|
> | | ca.ml.com> |
> | | Sent by: |
> | | nobody@groupstu|
> | | dy.com |
> | | |
> | | |
> | | 09/02/2002 |
> | | 08:45 PM |
> | | Please respond |
> | | to "Volkov, |
> | | Dmitry (Toronto|
> | | - BCE)" |
> | | |
> |--------+------------------------->
>
> >-------------------------------------------------------------
> -----------------------------------------------------------|
> |
> |
> | To: "'Edward Monk'" <emonk@att.net>
> |
> | cc: ccielab@groupstudy.com
> |
> | Subject: RE: local policy routing
> |
>
> >-------------------------------------------------------------
> -----------------------------------------------------------|
>
>
>
> Yes Edward,
>
> On both sides route-map will work.
> That I know..
> I always thought that router sources packets from IP of
> interface closest
> to
> destination.
> Looks like it depends on type of interface when we have local policy
> enabled
>
> Thanks,
>
> Dmitry
>
> > -----Original Message-----
> > From: Edward Monk [mailto:emonk@att.net]
> > Sent: Monday, September 02, 2002 11:37 PM
> > To: 'Volkov, Dmitry (Toronto - BCE)'; ccielab@groupstudy.com
> > Subject: RE: local policy routing
> >
> >
> > Dmitry,
> >
> > You need a route back. If you apply the route-map to both
> > sides it will
> > work. The route-map matches all packets so no changes needed.
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> > Behalf Of
> > Volkov, Dmitry (Toronto - BCE)
> > Sent: Monday, September 02, 2002 7:28 PM
> > To: 'ccielab@groupstudy.com'
> > Subject: local policy routing
> >
> > Hello group,
> >
> > Could You please explain me what is wrong here R9(s0)----(s0)R12:
> > (I can't ping loopbacks on R12 from R9)
> >
> > R9#
> > interface Ethernet0
> > ip address 170.240.8.1 255.255.255.0
> > !
> > interface Serial0
> > ip address 50.100.1.9 255.255.255.0
> > no fair-queue
> > !
> > ip local policy route-map test
> > ip classless
> > no ip http server
> > !
> > route-map test permit 10
> > set ip default next-hop 50.100.1.12
> >
> > sh ip ro
> > 170.240.0.0/24 is subnetted, 1 subnets
> > C 170.240.8.0 is directly connected, Ethernet0
> > 50.0.0.0/24 is subnetted, 1 subnets
> > C 50.100.1.0 is directly connected, Serial0
> > r9#
> >
> >
> > R12#
> > !
> > interface Loopback0
> > ip address 7.7.7.7 255.255.255.0
> > !
> > interface Loopback1
> > ip address 160.160.160.160 255.255.255.0
> > !
> > interface Serial0
> > ip address 50.100.1.12 255.255.255.0
> > !
> > ip classless
> > no ip http server
> >
> > Thanks,
> >
> > Dmitry
> > _________________________________________________________________
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