active standby in routers ?

[mirehteshamali]

Hi all,

All current redundancy protocols such as HSRP , VRRP and GLBP need two uplinks for redundancy . achieving link along with router redundancy .

i mean if one circuit goes  down other takes over . if one router goes down other takes over .

but the problem i am running here , is their is only one uplink and my  management wnat's to implement redundancy of routers .

such that if one routers fail other takes over . exactly similar to ASA ACTIVE AND STANDBY senario .

  can i achieve the same with routers ? 3800 ISR's ?

[douhanm]

Hello

I dont think you have much hope, if the router where the link is connected goes down having a second one won't help

There are of course scenarios where the link is n Ethernet link plugged into a switch and then it is possible to do

Regards

Matt

Sent from Cisco Technical Support iPad App

[mirehteshamali]

Matt,

thanks for reply .

isp link is single point of failure . but atleast i am assured that if  one router goes down other takesover .

how about NAT ?  when failover occurs  i guess sessions will be dropped ?

Nat synchronisation is beautifully implemented in ACTIVE and Stanby feaute in ASA .

Any link for HSRP SPEAKERS ALSO REPLICATING  TRANSLATIONS ?

[Latchum Naidu]

Hi,

What I understand is you have given one up link from ISAP and using two routers at your perimeter network looke like...
LAN-->L2 switch--> Two (R1 & R2) routers connected to this L2 switch and you have implemented HSRP for example.

In the above case if R1 is down then R2 will take over.
If the link between your LAN to L2 switch failes then there will be no communication.

And for your scenario (NAT failover) you need to use SNAT (statefull NAT)
http://www.cisco.com/en/US/docs/ios/12_2t/12_2t13/feature/guide/ftsnat.html

Hope the above helps you.

Please rate the helpfull posts.
Regards,
Naidu.