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Any resources on configuring IP SLA on Cisco 3500XL switch?

Hello All,

Does anyone know any resources on configuring Serive Level Agreements (IP SLA) on Cisco 3500XL switches. I need to be able to route traffic to a different gateway based on availablity. Thank You.
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greenbeanx81
Asked:
greenbeanx81
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1 Solution
 
JFrederick29Commented:
Pretty sure IP SLA is a "layer 3" feature meaning you need a multilayer/layer3 switch to use it (3550, 3560, etc...).  The 3500XL is a layer2 switch so I'm pretty sure it doesn't support it.
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greenbeanx81Author Commented:
Correction. Its is a 3550 series switch. Any resources?
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JFrederick29Commented:
Ahh, okay, that's good.

First off, you need to be running an IOS that supports IP SLA.  12.2(46)SE supports it and I believe you need the IP Services image at a minimum.

There aren't really any good Cisco configuration guides for IP SLA but I can give you a real world example of an ICMP probe to a host on the Internet for reachability purposes.  The probe ties to a route meaning if the ICMP probe to the host on the Internet fails, the default route is removed from the routing table as it is assumed the Internet connection is down.  You can then have a weighted/backup route installed.  Once the host is reachable again via the IP SLA probe, the route will be installed in the routing table again.

ip sla 1
 icmp-echo x.x.x.x   <--host on Internet
 frequency 10
ip sla schedule 1 life forever start-time now

track 1 rtr 1 reachability
 delay up 60

ip route 0.0.0.0 0.0.0.0 y.y.y.y track 1   <--where y.y.y.y is the primary default next hop
ip route 0.0.0.0 0.0.0.0 z.z.z.z 250  <--where z.z.z.z is the backup default next hop
ip route x.x.x.x 255.255.255.255 y.y.y.y    <--add a host route to your IP SLA probe target so it is always attempted to be reached via the primary connection
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