Redundant WAN connection & Redundant Routers
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12-21-2022 05:37 AM
Dear All,
we've two routers for internet and two internet links for redundancy, we're planning to configure HSRP between the routers from both LAN & WAN sides and it's straightforward if we had only one internet link, however since we've two internet links, please advise how can we manage both WAN links in HSRP.
Regards
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ISR 4000 Series
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ISR G2
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WAN
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12-21-2022 05:59 AM
can you draw the topology please ?
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12-21-2022 06:23 AM
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12-21-2022 06:45 AM
you mention WAN HSRP, do you use edge router that connec to internet ?
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12-21-2022 06:58 AM
No, we don't have edge router. both internet links came with GPON and will terminated on the routers shown on the diagram. we put layer 2 switch to enable routers connect both internet links.
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12-21-2022 07:03 AM
it easy but need work,
I will try lab it today show you how you can config it.
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12-21-2022 06:34 AM - edited 12-21-2022 06:35 AM
For now here is some example guides and lab people already done and blog the steps to achieve this.
https://www.routerfreak.com/how-to-configure-hsrp-on-a-cisco-router/
https://www.networkstraining.com/cisco-router-hsrp-configuration/
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12-21-2022 06:59 AM
the issue here is we've two internet links
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12-21-2022 07:53 AM
Concept is same each router going to each ISP, so the descision is to be made based on the Lan segment IP or traffic. either in or out.
you need to build up the config, and start testing - i would advise from Lan to outside.
WAN VIP - is bit different compare to LAN, since you have 2 ISP here.

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12-21-2022 08:38 AM
Hello,
HSRP requires at least a /29 subnet...are you getting this from your ISP(s) on the WAN side ?
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12-21-2022 10:45 AM
~
the first part is divide the LAN into two parts,
each part have HSRP group and have active/standby router
this make traffic load balance between two edge router.
then in my lab I use static route default toward R1 in both R2 and R3 (edge router).
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12-21-2022 11:45 AM
Dear MHM,
I really appreciate your extra effort.
Please correct me, if I'm wrong.
In my scenario R2 & R3 are going to be connected to Active-Standby Firewalls, which is expected to be a point-to-point IP connectivity and how do we divide the LAN into parts?
For WAN side connectivity, I don't see HSRP, are you suggesting configuring two default routes toward to both internet links?
Regards
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12-21-2022 11:50 AM
""No, we don't have edge router. both internet links came with GPON and will terminated on the routers shown on the diagram. we put layer 2 switch to enable routers connect both internet links.""
your answer before, I see only one router, and you mention that there is also ASA HA ? can you draw another topology ?
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12-21-2022 01:21 PM - edited 12-21-2022 01:23 PM
Please suggest what's recommended for such scenarios and attached is revised diagram.
