Cisco Ex SERIES Manual de usuario descargar pdf (Pagina 70)

Juniper Networks/Cisco Systems Switch Interoperability Cookbook

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Nexus7010# show spanning-tree vlan 2001

LAN2001

Spanning tree enabled protocol rstp

Root ID Priority 34769

Address 0024.f718.9ec1

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 34769 (priority 32768 sys-id-ext 2001)

Address 0024.f718.9ec1

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Interface Role Sts Cost Prio.Nbr Type

---------------- ---- --- --------- -------- --------------------------------

Eth3/1 Desg FWD 2 128.385 P2p

Eth3/3 Desg FWD 2 128.387 P2p

To verify all switches send traffic only over the spanning tree interfaces in forwarding

state, generate a known quantity of frames from Spirent TestCenter or other source to

each VLAN and compare switch interface packet counters with those sent and received

on each interface. Interfaces in blocking state will receive spanning tree BPDU frames

but should transmit no frames.

To determine convergence time, disable one of the spanning tree interfaces in forwarding

state while offering a known quantity of frames from Spirent TestCenter or other traffic

generator. Convergence time can be derived from frame loss. For example, if Spirent

TestCenter generates traffic at a rate of 1,000 frames per second, each dropped frame is

equivalent to 1 millisecond of convergence time. If the switches drop 47 frames, then

rapid spanning tree convergence time is 47 ms.

Virtual&LAN&(VLAN)&trunking&

Objective!

To verify interoperability of IEEE 802.1Q VLAN trunking between Juniper and Cisco

switches using tagged traffic.

To verify interoperability of IEEE 802.1Q VLAN trunking between Juniper and Cisco

switches using untagged (native) traffic.

Background!

The IEEE 802.1Q specification defines a method for defining virtual broadcast domains.

A 4-byte VLAN header, usually called a “tag,” allows definition of broadcast domains

that may differ from physical switch topology. Without VLANs, all switch ports are

members of the same broadcast domain; with VLAN tagging, a network manager can set

up multiple broadcast domains across switches, and restrict broadcasts for different

VLANs on different ports.

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Cisco Ex SERIES Manual de usuario Pagina 70