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CCNA 3 Labs and Study Guide - BINARYBB.INFO – @jagalbraith

CCNA 3 Labs and Study Guide - BINARYBB.INFO – @jagalbraith

CCNA 3 Labs and Study Guide - BINARYBB.INFO – @jagalbraith

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Figure 7-4 Determine the Root Bridge <strong>and</strong> Port Roles: Topology 3<br />

Priority: 45,056<br />

My path cost to root is lower 000d.ecdb.4be4<br />

than SWB, therefore my Gi0/1<br />

D<br />

is the designated port.<br />

Gi0/1<br />

SWA<br />

R<br />

Fa0/1 Gi0/2<br />

B<br />

Although we have the same<br />

cost to root, I have a lower<br />

BID than SWA, therefore my<br />

Fa0/1 is the designated port.<br />

100 Mbps<br />

000e.385d.e380<br />

Priority: Default<br />

Root Bridge <strong>and</strong> Port Roles<br />

1000 Mbps<br />

1000 Mbps 1000 Mbps<br />

Chapter 7: Spanning Tree Protocol 321<br />

R<br />

Gi0/1<br />

Gi0/2<br />

Priority: Default<br />

000e.8362.e383<br />

SWB<br />

B Fa0/1<br />

B<br />

100 Mbps<br />

D<br />

Fa0/1<br />

D<br />

Gi0/2<br />

R 1000 Mbps<br />

Gi0/2<br />

D<br />

D<br />

Fa0/1<br />

SWC Gi0/1<br />

Gi0/1<br />

D<br />

SWD<br />

My path cost to root is lower<br />

than SWB, therefore my<br />

Gi0/2 is the designated port.<br />

Logical, Loop-Free Spanning-Tree Topology<br />

SWD<br />

SWC SWA<br />

1-58713-171-4<br />

sl260704aa.eps<br />

05/29/06<br />

ICC<br />

000d.edd3.37a3<br />

Priority: 8192<br />

SWB<br />

Both Gi0/1 <strong>and</strong> Gi0/2<br />

have the same cost to<br />

root, therefore Gi0/1<br />

has the lower port ID<br />

<strong>and</strong> is my root port.<br />

I have the best BPDU.<br />

I am root.

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