From: Bajo (bajoalex@gmail.com)
Date: Mon Dec 31 2007 - 15:44:22 ARST
Hi Backbone,
Just do "deb ip pack det". It will show you that the router will send
a copy to each ip-enabled interface using each interface IP address as
the source.
The story is different on the receiving side (RPF check, group
membership ..etc)......
Rack1R1#deb ip pack det
IP packet debugging is on (detailed)
Rack1R1#ping 224.1.1.1
Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 224.1.1.1, timeout is 2 seconds:
*Dec 31 15:45:23.340: IP: s=145.1.125.1 (local), d=224.1.1.1
(Serial0/0), len 100, sending broad/multicast
*Dec 31 15:45:23.340: ICMP type=8, code=0
*Dec 31 15:45:23.340: IP: s=145.1.12.1 (local), d=224.1.1.1
(Serial0/1.12), len 100, sending broad/multicast
*Dec 31 15:45:23.340: ICMP type=8, code=0
*Dec 31 15:45:23.340: IP: s=145.1.13.1 (local), d=224.1.1.1
(Serial0/1.13), len 100, sending broad/multicast
*Dec 31 15:45:23.344: ICMP type=8, code=0
*Dec 31 15:45:23.344: IP: s=145.1.17.1 (local), d=224.1.1.1
(FastEthernet2/0), len 100, sending broad/multicast
*Dec 31 15:45:23.344: ICMP type=8, code=0
*Dec 31 15:45:23.344: IP: s=144.144.144.253 (local), d=224.1.1.1
(FastEthernet2/1), len 100, sending broad/multicast
*Dec 31 15:45:23.344: ICMP type=8, code=0
*Dec 31 15:45:23.344: IP: s=150.1.1.1 (local), d=224.1.1.1
(Loopback0), len 100, sending broad/multicast
*Dec 31 15:45:23.348: ICMP type=8, code=0
*Dec 31 15:45:23.348: IP: s=145.1.111.111 (local), d=224.1.1.1
(Loopback1), len 100, sending broad/mult
Rack1R1#shint
Interface IP-Address OK? Method Status
Protocol
Serial0/0 145.1.125.1 YES NVRAM up up
Serial0/1 unassigned YES NVRAM up up
Serial0/1.12 145.1.12.1 YES NVRAM up up
Serial0/1.13 145.1.13.1 YES NVRAM up up
Ethernet1/0 unassigned YES NVRAM up down
FastEthernet2/0 145.1.17.1 YES NVRAM up up
FastEthernet2/1 144.144.144.253 YES NVRAM up up
Loopback0 150.1.1.1 YES NVRAM up up
Loopback1 145.1.111.111 YES manual up up
On 12/31/07, backbone systems <backbone.systems@gmail.com> wrote:
> if i ping to
> ping 224.1.1.1 than there must be some dource from which i am pinging ???
> what is the source
>
> On Dec 31, 2007 6:27 PM, Joseph Saad <joseph.samir.saad@gmail.com> wrote:
>
> > It doesn't. It sends the packet on all interfaces, unless you force it via
> > extended ping.
> >
> > On Dec 31, 2007 5:36 PM, backbone systems <backbone.systems@gmail.com >
> > wrote:
> >
> > > Hey,
> > >
> > > sorry for this basic question . on a router if i have 3 ethernet and 1
> > > loop
> > > back interface with sparse-mode enabled. When i ping from the serial
> > > interface across the FR cloud
> > > how does the multicast choose the source interface.
> > >
> > > when i do debug ip mpacket i can see for different ping chooses
> > > different
> > > ether/lo interfaces
> > >
> > > What is the logic?
> > >
> > > BB
> > >
> > > _______________________________________________________________________
> > > 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
>
-- Kind Regards,Bajo
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