Multicast Issue

Unanswered Question
Jan 22nd, 2009
User Badges:

Say i have enable ip multicast-routing on Switch A, B and C. Switch B is a core switch. Next i put in the commands on Switch A, B and C


Connection link


PC C > SwC > SwB > SwA > PC A



SwA (Distribution Switch)

int gi1/1 to SwB

channel-group 2 mode on


Vlan A

ip pim sparse-dense-mode

no ip route-cache cef

ip cgmp

no ip mroute-cache


Port Channel 2 to SwB

ip pim sparse-dense-mode

ip cgmp





SwB (Core)

int gi1/1 To SwA

switchport

switchport access vlan B1

switchport mode access

no ip address


vlan B1

ip pim sparse-dense-mode

ip cgmp


int gi1/2 to SwC

switchport

switchport access vlan B2

switchport mode access

no ip address


vlan B2

ip pim sparse-dense-mode

ip cgmp





SwC (Server farm)

int gi1/1 to SwB

switchport access vlan C

switchport mode access


Vlan C

ip pim sparse-dense-mode

no ip route-cache cef

ip cgmp

no ip mroute-cache





Then I insert PC A to Switch A port and from PC C to Switch C port.


I do a ping from PC A to PC C and it work. However, if i use iperf, i am not able to capture the multicast packets from PC A to PC C


Does fast-switching cache affect multicast to be enable in the network?

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Loading.
mchin345 Thu, 01/29/2009 - 15:50
User Badges:
  • Silver, 250 points or more

Complete these steps to determine if the source is actually sourcing the packets and inserting the correct packet fields:

1. Check the interface counters on the host. First, check the interface counters (if you are on a UNIX system, use the netstat command) on the source host to see if it is sending packets. If it is not, check for misconfiguration or bugs in the host stack and application.

2. Use the show ip igmp groups interface-name command to check the upstream router to see if it received a join membership report at the interface directly connected to source.

Here is the link for Basic Multicast Troubleshooting Tools.

http://www.cisco.com/en/US/tech/tk828/technologies_tech_note09186a0080093f21.shtml#sourcepacket


Actions

This Discussion