From: Keith T. Hall (kthall@xxxxxxxxxxxxxx)
Date: Wed Nov 15 2000 - 11:55:41 GMT-3
Just guessing - don't have a Cat to play with right now...
Guess #1:
When you do a 'show arp' on the routers, do you see two different MAC
entries for the IP address 224.8.8.8 or a changing MAC entry (before ping /
after ping)?
The 'single ping' can be generated a few ways - to include an arp population
with multiple MACs for the same IP entry.
Try switching to Sparse Mode PIM with NBMA on the router interfaces (this
will generate unicast messages and should generate individual responses).
Guess #2:
Perform the following on the Catalyst:
show cam 01-00-5e-08-08-08 (for IGMP 224.8.8.8)
show cam 01-00-0c-dd-dd-dd (for CGMP)
Are both router ports listed on either / both?
Try taking CGMP and/or IGMP Snooping off of the Catalyst. CGMP may not see
the other router as a multicast subscriber (the join is only on one router -
correct?) and actually prune the traffic off after the first ping.
Normally CGMP is used between multicast subscribers and the router - not
between two routers. Theoretically, Dense Mode shouldn't care about
subscription and just flood everything anyway.
Keith T. Hall
Sr. Network Engineer, Service Provider Accounts
Greenwich Technology Partners
3810 Concorde Parkway, Suite 500
Chantilly, VA 20151
(703) 966-1854 Cell
(703) 222-6465 Office
(703) 222-6424 Fax
khall@greenwichtech.com
http://www.greenwichtech.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Brian
Sent: Tuesday, November 14, 2000 7:03 PM
To: cciemail
Subject: Multicast ping
Group,
Should I be able to consistently ping a multicast address from a cat5? I am
running dense-mode on an Ethernet segment with 2 routers. I have cgmp
enabled on the cat5, I have an ip igmp join group 224.8.8.8 on the ethernet
port of one of the routers. Should I be able to ping 224.8.8.8
consistently. The first ping is successful and it creates a static cam for
the multicast mac address, but the subsequent pings fail until the static
cam disappears again. Then it works again for one try.
Any ideas?
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