From: John (jgarrison1@austin.rr.com)
Date: Wed Feb 20 2008 - 13:09:02 ARST
The difference is the options you get with extended ping, but you shouldn't
need those options to test a multicast group address. I suggest reading the
config guide
http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/himc_c/mcbverfy.htm
----- Original Message -----
From: "YourPal" <dearprudence28@gmail.com>
To: <ccielab@groupstudy.com>
Sent: Wednesday, February 20, 2008 6:53 AM
Subject: Re: Testing multicast routing using extended ping
> Hi Group,
>
> I'd like to know the difference between doing an extended ping and doing a
> "ping...source" to a multicast group address.
>
> A lot of times I encountered in my workbook the multicast source is said
> to
> be located on one of the routers' LAN segment. To perform ping test from
> the
> said router, which method should I use: extended ping sourcing from the
> LAN
> address, or "ping...source" sourcing from the LAN interface?
>
> I remember vividly that sometimes doing "ping...source" does not really
> source from the specified interface.
>
> I'm confused. Please enlighten.
>
>
> Thank you.
>
> BR,
> Emil
>
>
> On 2/14/08, YourPal <dearprudence28@gmail.com> wrote:
>>
>> Hi Group,
>>
>> I have the following simple multicast scenario:
>>
>>
>> R3 (s0/0) -------Frame relay------- (s0/0.134 mp) R4 (Fa0/0)
>> |
>> |
>> |
>> |
>> Frame relay
>> |
>> |
>> |
>> |
>> R1 (s0/0/0.134 mp)
>>
>>
>> Details:
>>
>> - The interfaces are sparse mode.
>> - R1 joins multicast group 228.34.28.100 on its Fa0/0 interface. R4 is
>> the
>> RP for this group.
>> - RP discovery uses Bootstrap protocol. R3 is the BSR.
>> - The "ip pim nbma-mode" command is prohibited on R3. To work around, a
>> GRE tunnel is built between R1 & R4 with PIM sparse mode enabled.
>>
>> The task is to configure the network so that R1 responds to ICMP echo
>> requests sent to 228.34.28.100 coming from R4's Fa0/0 interface.
>>
>> Assuming everything is configured correctly, I'd like to know how to test
>> it. Should I do extended ping as follows?
>>
>> R4#pi
>> Protocol [ip]:
>> Target IP address: 228.34.28.100
>> Repeat count [1]:
>> Datagram size [100]:
>> Timeout in seconds [2]:
>> Extended commands [n]: y
>> Interface [All]: <Which interface??>
>> Time to live [255]:
>> Source address: <R4's Fa0/0 ip address>
>> Type of service [0]:
>> .
>> .
>>
>> What interface should I specify?
>>
>> Or should I just do "pi 228.34.28.100 so fa0/0"? Any difference?
>>
>> Appreciate any help.
>>
>>
>>
>> Thank you.
>>
>> BR,
>> Emil
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