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L2 Failover Plan for Point to Point

VAbr AVib
Beginner
Beginner

We have 2 point to point links from 2 different ISP's for the purpose of connecting to our data center from our office. We would like to configure a failover scenario using these two P2P links.

I have been trying with the sTP method but for some reason we could not succeed in this, could be because of the distance.

Please help me to implement a failover P2P conectivity usign this two links.

4 Accepted Solutions

Accepted Solutions

Jason Whitehead
Beginner
Beginner

I have an idea, is that possible? to configure HSRP between each other (connect two link to two separate switch for switch redundancy in each location) and keep separate traffic in separate VFR, I hope that will work fine, if you going with PortChannel concept you haven’t get switch redundancy, if you want switch redundancy you have to configure either stack or VSS, my suggestion will support both link redundancy and switch redundancy,

Looking forward to hear from you!

View solution in original post

Hi,

if you are connected to 2 different L2 devices  then you can't do a port-channel( all links in a port-channel must connect to the same devices).

QinQ is only performed in the ISP cloud so I don't think it should be an issue for you.

Regards

Alain

Don't forget to rate helpful posts.

Don't forget to rate helpful posts.

View solution in original post

16 Replies 16

Jason Whitehead
Beginner
Beginner
 

What if using Ospf ? And have 2 point to point links of different bandwidths , would you set the failover using cost ?

Sent from Cisco Technical Support iPad App

 

Jason,

Thanks for the detailed explanation.

Actually we had planned for either STP or Port channel as options to achieve the failover connectivity at L2 layer. The initial impression was that the port channel option might not be supported in a scenario where two different ISP's are enagaged. Now we are in a situation where the STP option is not applicable. Do you see any issue in achieving the port channel when we have two separate ISP ? Will the port channel works in case if ISP using Q-in-Q tagging at their side of the link. ?

Hi,

if you are connected to 2 different L2 devices  then you can't do a port-channel( all links in a port-channel must connect to the same devices).

QinQ is only performed in the ISP cloud so I don't think it should be an issue for you.

Regards

Alain

Don't forget to rate helpful posts.

Don't forget to rate helpful posts.

I have an idea, is that possible? to configure HSRP between each other (connect two link to two separate switch for switch redundancy in each location) and keep separate traffic in separate VFR, I hope that will work fine, if you going with PortChannel concept you haven’t get switch redundancy, if you want switch redundancy you have to configure either stack or VSS, my suggestion will support both link redundancy and switch redundancy,

Looking forward to hear from you!

Alain,

Thanks for your query.

Thats not a problem, we will be connecting the links to the same L2 device at both side.

Sharon,

I am new to HSRP on switch, have done with the routers. But again not sure with L2. Does HSRP work on L2 switch ?

Anyway at this moment we are not looking for switch redundancy, we will just accomplish the link redundancy.

Hi VAbr

please attach your topology, maybe we can find the solution thx

Regards,

Habibi

Regards, Habibi