01-12-2020 03:05 AM
Hi,
I'd like to ask for some help on what the best option in this network that we have.
A little background. We have this 4Mbps DLL that we used to link up at the other site. Last month we finally were able to purchase a back up link of 2Mbps for the site. Now, I want to aggregate both of these links to have a total bandwidth of 6Mbps however if its not possible I'd settle for an active-standby link.
The current network looks like this
All routing are statics. There is no router after the Distribution switches, it directly connects to the telco's local switch at the site. SiteB I believe only has 1 router that receives both of our links and would be terminated at the same router.
My question is.
1) If I want to combine my links, do I have to use bgp multi-path? I don't think i'll be able to combine them without a router in front of the distribution switches or by not using bgp multi-path
2) If I want to make them into an active passive link, how do I tackle this? Should I use a floating static route with SLAs toward the primary link and in the event it goes down use the backup link static route? Or its possible to do this via int vlan hsrp ?
Thanks
01-12-2020 03:29 AM
personally i do not believe you have aggregated bw here 6MB as single Pipe.
Instead, you can use a different way to utilize both the Links in a better way.
Do you have BGP in place ?
below options thinking you do not have BGP in place.
Options1 :
1. You can not have full redundant, since both the links are not equal. so if 4MB Link go down, you have only 2MB as standby, but not bad at least you have connectivity and there may be slowness reports here.
2. yes you need to configure IP SLA to track the link and failover if 4MB Fails to 2MB Links, once the 4MB Links up automatically restore the traffic back to 4MB for better performance.
Option2 :
1. you can use 4MB and 2MB Link both at a time, with PBR distribute the Load such a way, some Traffic go via 2MB Link.
2. Same way above IP SLA, you going to implement both the links
3. If 4MB Link go down, failover the traffic to 2MB.
4. if 2MB Link go down implement IP SLA to failover to 4MB
here good example kind of setup you looking.
http://letusexplain.blogspot.com/2014/04/ip-sla-tracking-configuration-with.html
01-20-2020 05:07 PM
01-12-2020 04:37 AM
Hello,
in addition to Balaji's suggestions: not sure how your hosts are connected to the core, but since you have two links that you pay for, you might as well use them both. GLBP with weighted load-balancing could work. What devices exactly are D101 and D102 ?
01-12-2020 05:13 AM - edited 01-12-2020 05:14 AM
Hello
@ShadowoftheD wrote:
Hi,
I'd like to ask for some help on what the best option in this network that we have.
A little background. We have this 4Mbps DLL that we used to link up at the other site. Last month we finally were able to purchase a back up link of 2Mbps for the site. Now, I want to aggregate both of these links to have a total bandwidth of 6Mbps however if its not possible I'd settle for an active-standby link.
Is this in relation to the dual connectivity to/from site 2 or does this query relate to multiple site with the same design - what about the corp core do you want to traffic engineer this also?
You mention you using static routing, but you also mention bgp also so can elaborate on this please?
01-12-2020 09:31 AM
01-21-2020 12:03 AM - edited 01-21-2020 04:04 AM
Hello
@ShadowoftheD wrote:
1) If I want to combine my links, do I have to use bgp multi-path? I don't think i'll be able to combine them without a router in front of the distribution switches or by not using bgp multi-path
2) If I want to make them into an active passive link, how do I tackle this? Should I use a floating static route with SLAs toward the primary link and in the event it goes down use the backup link static route? Or its possible to do this via int vlan hsrp ?
1-you are correct - you'll require a router interconnected between both switches to perform bgp- multipath that is unless the switch's are stacked and bgp is applicable on 3560s or another option to load balance using any igp such as osp) and/or incorporate perfromance edge routing as suggest by Joseph.
However without a router your options are limited and I would say at this time PBR is the better option.
2 if they are stacked you do have options in addition to the other suggestions such as flex link or link state tracking
01-21-2020 07:52 PM - edited 01-21-2020 09:27 PM
@paul driver wrote:1-you are correct - you'll require a router interconnected between both switches to perform bgp- multipath that is unless the switch's are stacked and bgp is applicable on 3560s or another option to load balance using any igp such as osp) and/or incorporate perfromance edge routing as suggest by Joseph.
However without a router your options are limited and I would say at this time PBR is the better option.
2 if they are stacked you do have options in addition to the other suggestions such as flex link or link state tracking
Is there an option PBR to track the link? it does follow the route-map configuration but i need tracking for failover
EDIT: forgot the reachability option
not stacked. not a fan of stacked switches as well
Thanks mate, will test this out in the lab and see how it works
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide