From: Jason Madsen (madsen.jason@gmail.com)
Date: Sun Jul 06 2008 - 21:40:17 ART
BVIs seem to work just fine too.
Jason
On Sun, Jul 6, 2008 at 2:00 PM, Edison Ortiz <edisonmortiz@gmail.com> wrote:
> Additionally, 'ip unnumbered'?
>
>
>
> Let's consider assigning IP addresses to the interfaces of a router using a
> class B network that has been subnetted using eight bits of subnetting.
> Every interface requires a unique subnet. Although each point-to-point
> serial connection has only two end points to address, if we assign an
> entire
> subnet to each serial interface, we use 254 available addresses for each
> interface where only two addresses are needed. If we use IP unnumbered on
> each serial interface, we save address space; the address of a LAN
> interface
> is "borrowed" and used as the source address for routing updates and
> packets
> sourced from the serial interface. In this way, address space is conserved.
> IP unnumbered only makes sense for point-to-point links.
>
> A router receiving a routing update installs the source address of the
> update as the next hop in its routing table. Normally, the next hop is a
> directly-connected network node. This is no longer the case if we use IP
> unnumbered because each serial interface "borrows" their IP address from a
> different LAN interface, each in a different subnet and possibly in a
> different major network. When IP unnumbered is configured, routes learned
> through the IP unnumbered interface have the interface as the next hop
> instead of the source address of the routing update. Thus we avoid an
> invalid next hop address problem due to the source of the routing update
> coming from a next hop that is not directly connected.
>
>
> http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a0080
> 094e8d.shtml#ip_ip_un<http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a0080094e8d.shtml#ip_ip_un>
>
>
>
>
>
>
>
> Edison Ortiz
>
> Routing and Switching, CCIE # 17943
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Fahad Khan
> Sent: Sunday, July 06, 2008 3:45 PM
> To: Sadiq Yakasai
> Cc: Joseph Saad; Cisco certification
> Subject: Re: IP address on serial interfaces of a router
>
>
>
> What is the logic behined that I can assign 10.0.0.1/24 (exactly the same
> ip
>
> address) on two serial interfaces of a single router???
>
>
>
>
>
> R1#sh run
>
>
>
> ---output omitted---
>
>
>
> interface Serial1/0
>
> ip address 10.0.0.1 255.0.0.0
>
> serial restart-delay 0
>
> !
>
> interface Serial1/1
>
> ip address 10.0.0.1 255.0.0.0
>
> serial restart-delay 0
>
>
>
>
>
> Wont the router be confused when it will forward traffic for
>
> 10.0.0.0/24network??
>
>
>
> Thanks and regards,
>
>
>
>
>
>
>
> On 7/6/08, Sadiq Yakasai <sadiqtanko@gmail.com> wrote:
>
> >
>
> > Huh????
>
> >
>
> > And how is this exactly related to ethernet again? :-)
>
> >
>
> > We digress again!
>
> >
>
> >
>
> > _______________________________________________________________________
>
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> >
>
> >
>
> >
>
> >
>
> >
>
>
>
>
>
> --
>
> Fahad Khan
>
>
>
>
>
> _______________________________________________________________________
>
> Subscription information may be found at:
>
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>
>
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