NLB with 6509 - Cisco Community

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Hello All,

Need help to configure 6509 for Microsoft NLB.

NLB is Multicast enabled with Virtual mac-address of 0300.5exx.xxxx

Cisco 6509 running 12.2(18)SXF9

When configuring the 6509 as per the document http://www.cisco.com/en/US/products/hw/switches/ps708/products_configuration_example09186a0080a07203.shtml

"

mac-address-table static 0300.5e11.1111 vlan 200

interface fa2/3 fa2/4 disable-snooping

"

will not have disable-snooping option available to configure.

However when the IGMP Multicast support option on the NLB, the mac-address will changes to 0100.5exx.xxxx and I am able to disable-snooping

According to the document http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SXF/native/configuration/guide/snooigmp.html#wp1034824

IGMP snooping constrains traffic in MAC multicast groups 0100.5e00.0001 to 0100.5eff.ffff.

does it mean if you the mac-address is 0300.5exx.xxxx you need not or cannot disable snooping due to IGMP Constraints, if so does this configuring 6000 for NLB is incorrect

Thank you in advance.

Regards

Hemanth

2 Replies 2

The disable-snooping parameter is essential and applicable only for Cisco Catalyst 6000/6500 series switches. Without this statement, the behavior is not affected. IGMP snooping does not constrain Layer 2 multicasts generated by routing protocols.

Hi,

NLB generated 0100.5exx.xxxx when IGMP support is enabled and 0300.5exx.xxxx when disabled.

disable-snooping option is only available when using the mac-address of 0100.5exx.xxxx and not when address beigns 0300.5e.

Permanent Multicast address range is 224.0.0.0 - 224.0.1.255 and and hence they will not come under IGMP snooping, however the range is outside this so we should be able to disable-snoop but option is not available or not required.

Regards

Hemanth

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