Cisco Ex SERIES Bedienungsanleitung PDF herunterladen (Seite 74)

Juniper Networks/Cisco Systems Switch Interoperability Cookbook

! ! !

Note that Cisco Nexus 7000 switches require the explicit “no shutdown” command to

enable interfaces. This command is not required in Cisco Catalyst switches.

Validation!

The Spirent TestCenter traffic generator/analyzer can be configured to offer bidirectional

traffic between pairs of access-mode interfaces on each switch. In all cases – involving

unicast, broadcast or multicast traffic – traffic will stay local to the VLAN in which it is

defined. For example, traffic offered to VLAN v2001 on the Juniper switch will be

forwarded only to interfaces in VLAN 2001 on the Cisco switch and vice-versa.

If desired, port mirroring can be enabled on either switch to verify that the trunk ports

carry tagged traffic for VLAN IDs 2001 and 2002 and untagged traffic for VLAN ID

2003.

As a final verification that VLANs limit broadcast domains, Spirent TestCenter can be

configured to offer traffic to the access ports with an VLAN ID of 2004. The trunk ports

on both switches will not forward this traffic.

Virtual&Router&Redundancy&Protocol&(VRRP)&interoperability&

Objective!

To validate failover functionality of the virtual router redundancy protocol (VRRP)

between Juniper and Cisco switches configured as routers.

Background!

As described in RFC 5798, two or more routers can make use of VRRP to enhance

network availability. With VRRP, multiple routers share a single virtual IP address. One

router acts as the master (active) device, while all others act as backups. If the master

router fails (or if a link fails on the interface configured with the virtual IP address), one

of the backup routers takes over as master.

Topology!

In this example, Juniper and Cisco switches are both configured to route IP traffic. The

interfaces connecting the switches each have unique IP addresses configured –

192.18.38.1/24 for the Juniper Virtual Chassis and 192.18.38.2/24 for the Cisco Nexus

7010. The Juniper and Cisco devices also share a single virtual IP address of

192.18.38.254/24, with the Juniper device initially acting as VRRP master.

The PCs attached to the Juniper and Cisco devices each use the virtual IP address of

192.18.38.254/24 as their default gateway. In the event of a failure of the master (Juniper)

device, the backup (Cisco) device will take over as master.

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Cisco Ex SERIES Bedienungsanleitung Seite 74