GLBP on Nexus 7000's

    We have GLBP configured on two Nexus 7000's using "load-balancing host-dependant" as our method of balancing. My question is, is there a quick way to determine which router each host is using. These are in production so any debugging is frowned on.
Thanks
David

Available command to verify GLBP operation is following
show glbp [group group-number]
Displays the GLBP status for all or one group.
show glbp capability
Displays the GLBP capability for all or one group.
show glbp interface interface-type slot/port
Displays the GLBP status for an interface.
show glbp interface interface-type slot/port [active] [disabled] [init] [listen] [standby]
Displays the GLBP status for a group or interface for virtual forwarders in the selected state.
show glbp interface interface-type slot/port [active] [disabled] [init] [listen] [standby] brief
Displays a brief summary of the GLBP status for a group or interface for virtual forwarders in the selected state.
But none of these will show you which host uses which AVF. In GLBP, Hosts still point to a default gateway IP address, but GLBP causes different hosts to send their traffic to one of up to four routers in a GLBP group. To do so, the GLBP Active Virtual Gateway (AVG) assigns each router in the group a unique virtual MAC address format 0007.B400.xxyy, where xx is the GLBP group number, and yy is a different number for each router (01, 02, 03, or 04). When a client ARPs for the (virtual) IP address of its default gateway, the GLBP AVG replies with one of the four possible virtual MACs. By replying to ARP requests with different virtual MACs, the hosts in that subnet will in effect balance the traffic across the routers, rather than send all traffic to the one active router. You can check ARP table of host and see the mac address of default gateway. But this is not an easy way.

Similar Messages

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    Hello Carl,
    What version of code are you running on your Nexus 7k?
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    http://www.cisco.com/en/US/docs/switches/datacenter/sw/nx-os/virtual_device_context/configuration/guide/vdc_mgmt.html#wp1170241
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  • Dell Servers with Nexus 7000 + Nexus 2000 extenders

    << Original post by smunzani. Answered by Robert. Moving from Document section to Discussions>>
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    Hi Vignesh
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  • LMS 4.2.2 Interface utilisation on Nexus 7000

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    God Bless.
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    Sim,
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  • Privilege Level for Tacacs Account in Nexus 7000

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  • Nexus 7000 - unexpected shutdown of vPC-Ports during reload of the primary vPC Switch

    Dear Community,
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    Problem solved:
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  • Using SNMP to monitor Nexus 7000 Series Supervisor Module

    Hello,
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    hope help,  and 
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  • Query Nexus 7000 Enviroment Status

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  • Rule based span on Nexus 7000

    Hi all,
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    Hi Joris,
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  • %ARP-3-DUP_VADDR_SRC_IP on two Nexus 7000 using HSRP

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    and dont forget to rate post

  • Log configuration changes to syslog on Nexus 7000?

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    **Encourage Contributors. RATE Them.**

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