From: Chris Lewis (chrlewiscsco@gmail.com)
Date: Wed Jun 14 2006 - 13:15:12 ART
Hi Petr,
The origin of this feature is not related to multipoint interfaces, as you
can see that one cannot apply identical IP addresses to ethernet multipoint
interfaces.
I believe the origin is inherited behavior from interface types or
encapsulations that could be used with SONET APS. In that scheme an
identically configured interface takes over if a filure occurs.
Chris
On 6/13/06, Petr Lapukhov <petrsoft@gmail.com> wrote:
>
> It's actually a feature :)
>
> The question is: why do we need that? :) As you can see, you
> may put IPs from same subnet on different subinterfaces, or even
> same IP on different subinterfaces.
>
> AFAIK, that make sense with multipoint subinterfaces, when
> you want to conserve IP address space and avoid problems
> like split-horizon at the same time.
>
> You that put single IP on different subinterfaces, and provide
> necessary frame-relay mappings for things to work correctly.
>
> HTH
> Petr
>
> 2006/6/13, Victor Cappuccio <cvictor@protokolgroup.com>:
> >
> > Hi Guys, could this be a Bug?
> >
> > Look at the IP Addresses at the Interfaces S0/0 and S0/1
> >
> >
> >
> > Thanks
> >
> > Victor.
> >
> >
> >
> > Rack1R5#show ip int brief | ex un
> >
> >
> > Interface IP-Address OK? Method Status
> > Protocol
> >
> > Ethernet0/0 152.1.125.5 YES manual up
> > up
> >
> > Serial0/0 152.1.45.5 YES manual up
> > up
> >
> > Serial0/1 152.1.45.5 YES manual up
> > up
> >
> > Ethernet1/0 152.1.5.5 YES manual up
> > up
> >
> > Loopback0 150.1.5.5 YES manual up
> > up
> >
> >
> >
> >
> > Rack1R5#show run
> >
> >
> > *Mar 1 07:22:27.241: %SYS-5-CONFIG_I: Configured from console by
> console
> >
> >
> > Rack1R5#show run int s0/0
> >
> >
> > Building configuration...
> >
> >
> >
> >
> >
> > Current configuration : 179 bytes
> >
> >
> > !
> >
> >
> > interface Serial0/0
> >
> >
> > ip address 152.1.45.5 255.255.255.0
> >
> >
> > encapsulation frame-relay
> >
> >
> > no fair-queue
> >
> >
> > frame-relay map ip 152.1.45.4 504 broadcast
> >
> >
> > no frame-relay inverse-arp
> >
> >
> > end
> >
> >
> >
> >
> >
> > Rack1R5#show run int s0/1
> >
> >
> > Building configuration...
> >
> >
> >
> >
> >
> > Current configuration : 116 bytes
> >
> >
> > !
> >
> >
> > interface Serial0/1
> >
> >
> > ip address 152.1.45.5 255.255.255.0
> >
> >
> > encapsulation ppp
> >
> >
> > clock rate 64000
> >
> >
> > no cdp enable
> >
> >
> > end
> >
> >
> >
> >
> >
> > Rack1R5#
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Sat Jul 01 2006 - 07:57:32 ART