Is it possible to configure an aggregation etherchannel between two routers and one L3 switch, means that : the one link in : R1 <-> L3 Switch1 , and the second aggregation link in : R2 <-> L3 Switch1 ? in this topology, the target is that one IP adress will be flapping and shared by the two both separate router aggregate to one L3 switch with one portchannel IP ? if yes, could anyone advise how to do that ?

  • 1
    That's not how etherchannel works. What you've described is HSRP (cisco) or VRRP (standard). You want R1 and R2 to share the same address in an active/standby role.
    – Ricky
    Dec 5 '18 at 17:34
  • @RickyBeam , here, the purpose is that i have just only IP address to be configured in two differents devise (adding channel member on two differents devise) to aggregate in two link channel member in one switch. Dec 6 '18 at 6:00

No. All the channel members on one end of the channel must be on the same device. If you are looking for a single IP address in the switch, you could do that on an SVI and connect layer-2 switch interfaces to the routers, but you do not want duplicate addresses, and you cannot channel to two separate devices.

  • Thank you for your answer ... I am looking the way to redundant my router for an interconnection a transit provider. they just allocate 1 IP, so I'm looking the way that single IP could flapping between two differents routers . (when the one goes down, the other take all trafic) Dec 5 '18 at 14:02
  • If you had something like a firewall cluster that may work, but not with a standard router.
    – Ron Maupin
    Dec 5 '18 at 14:59

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