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Juniper Networks/Cisco Systems Switch Interoperability Cookbook

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Interopera b ility -testing!

For each interoperability test described here, this document uses a five-section format

consisting of objective, technical background, Juniper configuration, Cisco configuration

and test validation.

Cisco&Discovery&Protocol&(CDP)&passthrough&

Objective!

To verify the ability of a Juniper switch to forward Cisco Discovery Protocol (CDP)

traffic between two Cisco devices.

Background!

The proprietary Cisco Discovery Protocol (CDP) allows sharing of information, such as

IP address, model number, and power requirements among connected Cisco devices.

Cisco devices use CDP messages to transmit information about their capabilities to

other Cisco products in the network. Accordingly, an interoperability requirement for

any Juniper switch in the path between two Cisco devices is the ability to “pass

through” CDP traffic without affecting CDP operation.

No extra configuration of Juniper or Cisco switches is required for CDP passthrough.

Because Juniper EX Series and QFX Series switches forward CDP messages in regular

Ethernet frames, a standard Ethernet switching configuration will work. Similarly, CDP

is enabled by default on most Cisco devices, so no additional configuration is needed.

Topology!

In this example, Cisco Catalyst 3850 and Cisco Nexus 7010 switches will use CDP to

exchange model numbers and interface information across two Juniper EX9208 switches

in a Virtual Chassis configuration. Though not required for this test, the inter-switch links

also used link aggregation to bundle one or more physical interfaces into a single logical

pipe. There is a separate section in this document describing link aggregation

configuration.

The interfaces used are as follows:

• Cisco Catalyst 3850: TenGigabitEthernet1/1/3, TenGigabitEthernet1/1/4, and

Port-channel2 (t1/1/3, t1/1/4 and po2)

• Juniper Virtual Chassis with EX9208: xe-5/3/1, xe-12/3/0, and ae1 (to Catalyst

3850); and xe-5/0/5, xe-12/0/5, and ae2 (to Nexus 7010)

• Cisco Nexus 7010: Ethernet3/9, Ethernet3/10, and port-channel1 (e3/9, e3/10, and

po1)

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