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Juniper Networks/Cisco Systems Switch Interoperability Cookbook

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Topology!

This configuration example will validate VLAN trunking interoperability between

Juniper and Cisco switches in three ways:

• The switches will forward allowed tagged traffic from multiple VLANs across a

trunk port

• The switches will forward allowed untagged traffic from a native VLAN across a

trunk port

• The switches will not forward disallowed tagged traffic across a trunk port

The final example above is a negative test to verify that switches will forward only traffic

explicitly permitted by VLAN trunking configurations.

Figure 16 below illustrates the test bed used to verify VLAN trunking operation. In this

example, a VLAN trunk carries allowed VLAN traffic between a Juniper Virtual Chassis

(comprising two Juniper EX9208 switches) and a Cisco Nexus 7010. Both switches use

10-gigabit Ethernet interfaces for the trunk port in this example, though VLAN trunking

also would work on any matched pair of Ethernet interfaces. The trunk ports on each

switch will allow tagged traffic with VLAN IDs 2001 and 2002, and untagged (“native”)

traffic from ports with a VLAN ID of 2003. A fourth VLAN, with a ID of 2004, also

exists, but the trunk port is configured not to allow that traffic.

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Cisco Ex SERIES Manual de usuario Pagina 71