Fwd: [c-nsp] IOS device failover

[Paul Kohler]

Tim,

Without knowing more about what you're looking to do Gateway Load Balancing 
Protocol (GLBP), Enhanced Object Tracker (EOT), Server Load Balancing 
(SLB), and OER are features that you want to check out. Here are some 
points to keep in mind:

GLBP:
Allows load sharing across gateways and uplinks
Used at layer-2 to layer-3 boundary
Includes failover protection
Multiple routers participate in virtual router group with a virtual IP address
One member is elected as active virtual gateway and handles ARP requests
Other members are active virtual forwarders

EOT:
Extends the familiar Interface Tracking mechanism of Hot Standby Router 
Protocol (HSRP)
Many Tracking Objects possible
Provides flexible control over EOT clients like GLBP
Can be used in combination with Reliable Static Routing, IP SLAs 
(previously 'SAA') and Embedded Event Manger (EEM)
Not a load balancing technology itself but can be leveraged by load 
balancing technologies

SLB:
Solution requires interaction between routers and servers. Both need to 
support SLB.
Defines a virtual server that represents a group of real servers (server 
farm) via a virtual IP address
C6500 and IOS software-based platforms are supported
Specifically targeted at server load balancing

OER:
Prefix based monitoring and optimization
Supports the optimization of up to 5,000 prefixes
Both Passive Monitoring (NetFlow) and Active Probing (IP SLAs)
Learning process where 1st  NetFlow determines prefixes of greatest 
throughput and latency then 2nd IP SLA for every path to those prefixes.
Outbound now, Inbound coming
Prefix by prefix based balancing to 1000s of common destination networks

Rick Williams and I are writing a ppt preso for CCO on these and other load 
balancing technologies.

Paul

> >Hello,
> >
> >I am wondering if there is currently a feature in IOS that will let me do
> >the following:
> >
> >If server A fails, I'd like traffic to be redirected to server B.
> >
> >I know I can do this with a sorryserver on any of the CSS models, but what
> >I'd like to know is if I can do it in IOS using some combination of
> >OER/SAA/RTR/NAT/Route-maps.
> >
> >Thanks for any replies.
> >
> >Tim
> >_______________________________________________
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