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тАО07-12-2010 11:54 PM
тАО07-12-2010 11:54 PM
Flex10 IGMP snooping and Data-driven IGMP
Hi,
we own a C7000 with two Flex-10 10Gb. Also, we have some B460C G5.
I observe strange behavior of IGMP snooping, it seems that it does not work if the network is not linked to an uplink port. Is it an expected behavior? I observe correct behavior if the network is connected to an uplink port even if multicast traffic is sent and received inside the blade center.
moreover, does the Flex-10 module handle Data-driven IGMP?
we own a C7000 with two Flex-10 10Gb. Also, we have some B460C G5.
I observe strange behavior of IGMP snooping, it seems that it does not work if the network is not linked to an uplink port. Is it an expected behavior? I observe correct behavior if the network is connected to an uplink port even if multicast traffic is sent and received inside the blade center.
moreover, does the Flex-10 module handle Data-driven IGMP?
3 REPLIES 3
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тАО07-13-2010 09:03 AM
тАО07-13-2010 09:03 AM
Re: Flex10 IGMP snooping and Data-driven IGMP
There is a specific fix for IGMP Snooping in VC firmware version 2.33, please make sure you are using that version.
Flex-10 does not currently support Data-driven IGMP, in other words it floods all unregistered multicast.
Flex-10 does not currently support Data-driven IGMP, in other words it floods all unregistered multicast.
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тАО07-14-2010 05:46 AM
тАО07-14-2010 05:46 AM
Re: Flex10 IGMP snooping and Data-driven IGMP
Some Cisco IOS versions also have a similar bug/issue: their IGMP snooping feature does not really work if nobody in the segment is sending IGMP queries.
A multicast-aware router will periodically send IGMP queries, fulfilling the requirement. If the segment is non-routable (e.g. an isolated network segment for security reasons), there is a "IGMP Querier" feature that can fulfill the requirement without an actual multicast router.
See Cisco's document about the problem:
http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a008059a9df.shtml
It lists 5 possible solutions/workarounds. Perhaps some of those ideas are applicable in the blade center too?
MK
A multicast-aware router will periodically send IGMP queries, fulfilling the requirement. If the segment is non-routable (e.g. an isolated network segment for security reasons), there is a "IGMP Querier" feature that can fulfill the requirement without an actual multicast router.
See Cisco's document about the problem:
http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a008059a9df.shtml
It lists 5 possible solutions/workarounds. Perhaps some of those ideas are applicable in the blade center too?
MK
MK
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тАО07-15-2010 12:13 AM
тАО07-15-2010 12:13 AM
Re: Flex10 IGMP snooping and Data-driven IGMP
HEM, Yes I am already in 2.33 firmware. Thanks for information about Data-driven IGMP.
Matti Kurkela, My problem is not flooding when there is no "IGMP querier" it seems that it is normal for a non Data-driven IGMP Switch. but my problem is that behavior change if it is a network that has an uplink port or has not.
if there is no uplink port even if I have a/some "IGMP querier" the multicast is received on every blades.
Matti Kurkela, My problem is not flooding when there is no "IGMP querier" it seems that it is normal for a non Data-driven IGMP Switch. but my problem is that behavior change if it is a network that has an uplink port or has not.
if there is no uplink port even if I have a/some "IGMP querier" the multicast is received on every blades.
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