ā01-26-2012 12:56 PM - edited ā03-07-2019 04:34 AM
We have a 6500 Dist Switch that connects to two access switches. We're trying to Multicast image the machine on the access switches and we notice that there is an issue where machines on Switch A can be imaged using multicast But machines on switch B cannot be imaged. The only difference that I have found in the configs are on the trunk links/
The 6500 has to Switch A
switport mode trunk
switchport trunk encap dot1q
The 6500 has to Switch B
switport mode trunk
switch A
switport mode trunk
switchport trunk encap dot1q
Switch B
switport mode trunk
switchport trunk encap dot1q
The only command missing on trunk config on 6500 dist Switch to switch B is switchport trunk encap dot1q . Could this cause Multicast issues>? Everything else is working fine. No issues.
ā01-26-2012 01:05 PM
The only command missing on trunk config on 6500 dist Switch to switch B is switchport trunk encap dot1q . Could this cause Multicast issues>
Maybe the 6500 line card only support 802.1q trunking. To verify, enter the command "sh interface
ā01-26-2012 01:27 PM
Yep, you're right Leo. Any ideas as to why Multicast would work to one switch and not the other? All the config is identical
ā01-26-2012 02:40 PM
Is IGMP enabled on switch B?
Are the sender and receiver both in the same vlan?
Is the 6500 doing layer-3 (SVI)?
HTH
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