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CCNP ROUTE Command Guide: Implementing Path Control

Mar 23, 2010

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Cisco IOS IP Service Level Agreements

Figure 5-1 shows the network topology for the configuration that follows, which shows the use of Cisco IOS IP SLA functionality for path control.

Figure 5-1 Cisco IOS IP Service Level Agreements

Customer requirements:

Customer A is multihoming to ISP-1 and ISP-2.
The link to ISP-1 is the primary link for all traffic.
Customer A is using default routes to the ISPs instead of BGP.
Customer A is using static routes with different administrative distances to make ISP-1 the preferred route.

Potential problem: If ISP-1 is having uplink connectivity problems to the Internet, Customer A will still be sending all of its traffic to ISP-1, only to have that traffic lost.

Solution: IOS IP SLA will be used to announce conditionally the default route to ensure reachability of a specific destination.

Follow these steps to configure Cisco IOS IP SLA functionality:

Step 1. Define one (or more) probes.
Step 2. Define one (or more) tracking objects.
Step 3. Define the action on the tracking object(s).
Step 4. Verify IP SLA operations.

Step 1: Define One (or More) Probes

R1(config)#ip sla monitor 22	Begins configuration for an IP SLA operation and enters SLA monitor configuration mode. 22 is the operation number and is a number between 1–2147483647.
R1(config-sla-monitor)#type echo protocol ipIcmpEcho 10.1.1.1 source-interface fastethernet 0/0	Defines an ICMP Echo operation to destination address 10.1.1.1 through source interface of FastEthernet 0/0 and enters ICMP Echo configuration mode.
R1(config-sla-monitor-echo)#frequency 10	Sets the rate at which the operation repeats. Measured in seconds from 1–604800 (7 days).
R1(config-sla-monitor-echo)#exit	Exits IP SLA Monitor ICMP Echo configuration mode and returns to global configuration mode.
R1(config)#ip sla monitor schedule 22 life forever start-time now	Sets a schedule for IP SLA monitor 22. Packets will be sent out immediately and will continue forever.

Step 2: Define One (or More) Tracking Objects

R1(config)#track 1 sla 22 reachability	Configures the tracking process to track the reachability of IP SLAs operation 22.
	NOTE This command was introduced in Cisco IOS Release 12.4(20)T and replaces the track rtr command.

Step 3: Define the Action on the Tracking Object(s)

R1(config)#ip route 0.0.0.0 0.0.0.0 11.1.1.1 3 track 1

Announces a default route to 11.1.1.1 with an administrative distance of 3 if the tracking object 1 is true.

Step 4: Verify IP SLA Operations

R1#show ip sla configuration	Displays SLA components such as frequency, target address, scheduling, and other parameters.
R1#show ip sla statistics 22	Displays number of successful and failed probes, last operation, start time, and last return code for SLA monitor 22.
R1#show ip sla statistics 22 detail	Displays more in-depth output for SLA monitor 22.

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