How to disable CDP on multiple sub-interfaces from physical bearer

cdpcisco-commands

You can enable flow on the physical bearer and it will automatically add the flow configuration to any subsequent sub-interfaces using ip route-cache flow.

Is there any way to disable/enable CDP on the physical interface and it automatically cascades to the sub-interfaces?

I need to enable CDP on 350 devices for the LAN facing ports only via a script, the WAN interface is always g0/0 but sites have a variety of VRFs/sub-interfaces.

Best Answer

CDP is not sent per subinterface. CDP is sent to a specific, link-only, multicast address that is sent either on the physical interface, or only one subinterface. Cisco has a document, Behavior of Cisco Discovery Protocol between Routers and Switches, that describes the behavior

You can disable CDP on the physical and subinterfaces by disabling is on the physical interface.

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Cisco config example for Policy Based Routing

I would recommend using a route-map for only one purpose (one for nat, another to pbr); mixed use can make for a mess. For NAT, the match interface will apply post-routing -- handy to make conditional nat entries.

The route-map for PBR should use an ACL to match the traffic coming from LAN2 and then set the next-hop to the desired interface with set interface not set default -- or set ip next-hop dynamic dhcp as you won't know the actual gw address. This bypasses / overrides any routing logic that would otherwise send then traffic to your expensive WAN.

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Depending on which version of 12.x you're on, you should be able to do the following:

router(config)#sip-ua
router(config-sip-ua)#no transport tcp
router(config-sip-ua)#no transport udp

This stops the router from listening on port 5060.

Best Answer

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