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High Availability

acastilloh5690
Level 1
Level 1

Hello. I have the topology appended to this discussion, that comprises two ISPs that connect to our enterprise L3 switch, which is connected to our firewall and the rest of the enterprise network. I need to find a solution to substitute the L3 switch for two routers with high availability for redundancy but I don't want to add more equipment than the 2 new routers. Which routers can I use and what solution for high availability. In case there is no way to provide high availability without adding another hop, which L3 switch with stacking capabilities can you recommend? (it needs two support at least 5 100Gbps interfaces)

4 Replies 4

balaji.bandi
Hall of Fame
Hall of Fame

Hello,

 

your topology (if that represents your real, live network) looks a bit unusual, as the firewall would normally be placed at the Internet facing edge...

 

Either way, one possibility would be to get two 4431 or 4461 routers and configure Interchassis High Availability, or stateful interchassis redundancy...

 

Configuring High Availability

 

https://www.cisco.com/c/en/us/td/docs/routers/access/4400/software/configuration/guide/isr4400swcfg/bm_isr_4400_sw_config_guide_chapter_01100.html

 

Configuring Stateful Interchassis Redundancy

 

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_nat/configuration/xe-3s/nat-xe-3s-book/iadnat-stateful-int-chass.pdf

Just one question. Do interchasis high availability requiere the routers to be connected at L2? 

You can also connect back to back (means router to router)

 

if they are reachable distance as per Ethernet limits.

BB

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