Todd Lammle's CCNA/CCENT IOS Commands Survival Guide

Author:Todd Lammle
Language: eng
Format: epub
Publisher: Wiley
Published: 2014-01-26T16:00:00+00:00

RSTP (802.1w)

Configuring RSTP is as easy as it is for any of the other 802.1d extensions. Considering how much better it is than 802.1d, you’d think the configuration would be more complex, but you’re in luck—it’s not. So let’s turn in on the Core switch now and see what happens:

Core#config t Core(config)#spanning-tree mode ? mst Multiple spanning tree mode pvst Per-Vlan spanning tree mode rapid-pvst Per-Vlan rapid spanning tree mode Core(config)#spanning-tree mode rapid-pvst Core(config)# 1d02h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to down 1d02h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to up

Sweet! The Core switch is now running the 802.1w STP. Let’s verify that:

Core#show spanning-tree VLAN0001 Spanning tree enabled protocol rstp Root ID Priority 32769 Address 000d.29bd.4b80 This bridge is the root Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32769 (priority 32768 sys-id-ext 1) Address 000d.29bd.4b80 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- ------------ Fa0/5 Desg FWD 19 128.5 P2p Peer(STP) Fa0/6 Desg FWD 19 128.6 P2p Peer(STP) Fa0/7 Desg FWD 19 128.7 P2p Peer(STP) Fa0/8 Desg FWD 19 128.8 P2p Peer(STP)

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