OT: Re: Redundant servers with the same ip address on different

Did you tie your SLA to an EEM applet or script or what? Too many
variables to know what the best choice might be in your given network
topology but one rather simplistic brute-force approach might be to
establish reachability SLAs to your servers and have routes advertised
into the network based on the condition of those SLAs. You could use
prefix length or metrics or whatever to steer traffic to the primary
when it's up and to the secondary when it's not. Not very elegant and
reconvergence isn't going to be exactly snappy but that's one passing
idea, anyway.

It's been a handful of years now but I once grappled with a Mobile IP
design and ultimately wound up shelving it and deployed a fairly
complex blend of DMVPN and SLAs in it's place. Mobile IP minimally
does what it's supposed to and not much else. Both High Availability
and robust security features are lacking, IMHO. I haven't really
looked into IPv6 Mobile IP but I understand some of the IPv4
shortcomings have been or are being addressed. Guess I'll put one
more thing on my list of stuff I need to read up on...

On Dec 26, 2010, at 2:25 , Planet Sun wrote:

> i tried the SLA but it doesn't work
>
>> Date: Sun, 26 Dec 2010 15:36:58 -0500
>> From: v.shekhar_at_globalassurance.net
>> To: go_soon2010_at_hotmail.com
>> CC: ccielab_at_groupstudy.com
>> Subject: Re: Redundant servers with the same ip address on
>> different PEs
>>
>> Without going to very specifics,
>> you can always advertise a /32 to this kind of scenario. Use the IP
>> SLA feature to do some creative health checks and /32 route
>> redistribution.
>>
>> Ofcourse you can also consider newer technologies like OTV or Metro
>> ethernet/DLSW to have L2 connectivity between Datacentres.
>>
>> -Vijay Shekhar
>> CCIE(sec)#17589/CISSP/RHCE.
>> http://au.linkedin.com/in/vshekhar
>>
>>
>> Quoting Planet Sun <go_soon2010_at_hotmail.com>:
>>
>>> I found the following at somewhere
>>>
>>> I have setup of 2 servers on 2 different PEs and work as a redundant
>>> .IF S1 becomes down ,S2 comes up with the same IP address of S1 .
>>> how can i configure that setup so that all the network can reach the
>>> 2 servers when any of them is up .
>>> I thought about the Mobile IP but the servers on VRF . Is there any
>>> different technology other than the mobile ip to solve this issue ?
>>>
>>>
>>> I hope i can find a solution for that too i almost have the same
>>> problem
>>>
>>>
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Received on Sat Jan 01 2011 - 12:47:27 ART