Cisco Wide Area Virtualization Engine 274 Troubleshooting Guide download pdf (Page 164)

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Cisco Wide Area Application Services Configuration Guide

OL-26579-01

Chapter 1 Configuring Traffic Interception

Using Policy-Based Routing Interception

To verify whether the WAE is CDP visible to a device that has been configured to use PBR, enter the

show cdp neighbors command on the device. If the WAE is CDP visible to the device, the WAE will be

listed in the output of the show cdp neighbors command.

Method 1: Using CDP to Verify Operability of WAEs

If the device that is configured to use PBR views the WAEs as a CDP neighbor (the WAE is directly

connected to the device), you can configure CDP and ICMP to verify the availability of a WAE as a PBR

next hop.

The following example shows how to use this method to verify PBR next-hop availability of a WAE. You

must complete the following configuration process for each of the LAN and WAN route maps that are

configured when CDP should be used.

To use CDP to verify operability of WAEs, follow these steps:

Step 1 On the router where PBR is configured (for example, on the branch office router named Edge-Router1),

enter configuration mode and enable CDP on the router:

Edge-Router1(config)# cdp run

Step 2 Enable route-map configuration mode for the route map, WAAS-EGDE-LAN, which has already been

created on the router:

Edge-Router1(config)# route-map WAAS-EDGE-LAN permit

Step 3 Configure the router to use CDP to verify the availability of the configured next-hop addresses:

Edge-Router1(config-route-map)# set ip next-hop verify-availability

Step 4 Enable CDP on the WAE (for example, on the branch office WAE named Edge-WAE1) that you want the

router to redirect traffic to using PBR:

Edge-WAE1(config)# cdp enable

If you are configuring PBR and have multiple WAEs and are using Method 1 to verify the PBR next-hop

availability of a WAE, no additional configuration is necessary after you have completed the preceding

process.

Method 2: Using IP SLAs to Verify WAE Operability Using ICMP Echo Verification (Recommended

Method)

To use IP SLAs and ICMP (the recommended method) to verify PBR next-hop availability of a WAE,

follow these steps:

Step 1 On the branch office router named Edge-Router1, enter the route-map configuration mode for the route

map named WAAS-EDGE-LAN, which has been previously configured on this router:

Edge-Router1(config)# route-map WAAS-EDGE-LAN permit

Step 2 Specify a match condition for the traffic. In the following example, the match condition specifies access

list number 105:

Edge-Router1(config)# match ip address 105

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