1 Reply Latest reply: Jun 17, 2011 6:23 AM by 804027 RSS

    IPMP configuration clarification

      Hello All,

      Recently i came acrossed a server , in which IPMP is configured entirely in a different way .

      Normally to configure IPMP, we need atleast 2 Physical interface . Each interface needs to have dedicated IPaddress and one virtual ipaddress needs to be configured to perform failover between the 2 nics .

      But the server i came across has following configuration in their hostname.e100g* files and the IP address 193.XX.XX.15 is configured only ong the e1000g0 . When i disconnect a nic card in e1000g0, the ipaddress is failling over to e1000g1. I have no idea how they configured , their is no "addif" command in the /etc/hostnames.e100g* files. No virtual ipaddress configured . I am puzzled how the nic failover works. I just want to know how IPMP configured in this server. Please advise me , if i need to attach any other information.

      ifconfig -a
      lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232 index 1
      inet netmask ff000000
      e1000g0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
      inet 193.xx.xx15 netmask ffffff00 broadcast 193.xx.xx.255
      groupname ipmp_grp
      ether 0:23:8b:3:cb:e0
      e1000g1: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 3
      inet netmask ff000000 broadcast
      groupname ipmp_grp
      ether 0:23:8b:3:cb:e1

      more hostname.e1000g0
      monappp068 group ipmp_grp up

      more hostname.e1000g1
      group ipmp_grp up

      Many thanks.
        • 1. Re: IPMP configuration clarification
          You can configure IPMP in two ways:
          - probe based: you configure one IP in each nic and one "virtual IP". The probes on the interfaces are made by the ipmp daemon pinging the default router.
          - link based: you configure only one ip on one nic and define the ipmp group on all the nic members. When the ipmp daemon detects a link-lost signal on the physical media, produces a failover to the "backup" nic.