CGMP fast leave enables the layer 2 switch to snoop IGMP v2 leave packets and directly send an IGMP membership query on the port from where it received the IGMP v2 leave to check if there are still hosts interested in the multicast group on the port.
Then, the MAC address of the user is removed from the multicast layer 2 forwarding table of the access switch.
If there are no more hosts on the access switch, the leave message is sent on the uplink to prune the access switch completely (same process).
My question is: if I don't use CGMP fast leave but cgmp only, will my IGMP leave message trigger a CGMP leave from the querier even if the host leaving the group is not the last one in the multicast group?
According to Cisco documentation, it won't be the case. But on one of my testbed, I saw CGMP leave messages triggered by the querier even when it was not the last host leaving the group. So was it a bug or a normal behaviour?
I would rather have these CGMP messages triggered all the time since they would prevent flooding on non-interested ports.
So since my multicast flows will be quite heavy and I need to optimise the load on all clients, I'll need to configure CGMP fast leave.
I'm a bit confused with the HSRP address conflict.
On a simple 2 layer VLAN (2 redundant cores and access switches directly dual connected on themIf I enable CGMP fast leave on access switch only (not on cores), HSRP packets will not be snooped and I shouldn't introduce any latency in HSRP process. Am I right?
Do I need to enable fast leave on all switches on my VLAN?
Is anybody using fast leave in a production environment? Any feedback?
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.