D-Link DGS-6600-48TS Configuration Guide - Page 152

Volume 3-Layer 2 Configurations / Chapter 14-Spanning Tree Protocol (STP) Configuration Step 2: Use the commands below to check the RSTP configuration on R2: Configuration Examples DGS-6600:15#show spanning-tree Spanning tree : Enabled, Mode : RSTP Forwarding BPDU : Disabled Root ID Priority : 4096 Address : 00-01-02-03-04-00 Root Path Cost : 20000 Hello Time : 2 sec, Max Age : 20 sec, Forward Delay : 15 sec Bridge ID Priority Address Hello Time TX Hold Count : 32768 : 06-0b-00-27-00-00 : 2 sec, Max Age : 20 sec, Forward Delay : 15 sec : 6 Topology Changes Count : 2 codes - F : Fast forwarding is configured as enabled Configured link type : A - Auto, P - point to point, S - shared Priority Link Interface Role State Cost .Port Type Edge FA eth2.1 Designated Forwarding 200000 128.65 P2P Edge FA eth2.3 Designated Forwarding 200000 128.67 P2P Edge A eth2.5 Root Forwarding 20000 128.69 P2P None-Edge A eth2.6 Alternate Discarding 20000 128.70 P2P None-Edge Notes: Please Check whether PCs in same VLAN can ping each other. Unplug eth2.5 cable. The PING will be time-out for few second (3-7 sec) and will be back, indicating the redundancy working. MSTP Configuration Example In this example, MSTP is configured to provide (1) loop avoidance, (2) Redundant links and (3) Load sharing. MSTP instance 0 contains VLAN2; MSTP instance 1 contains VLAN3. R1 is the root bridge for both instance 0 and 1. For instance 0, the blocking port is on R2 eth2.6, and therefore VLAN2 traffic will be forwarded using eth2.5 link. For instance 1, the blocking port is on R2 eth2.5, and therefore VLAN3 traffic will be forwarded using eth2.6 link. This can provide load sharing function. If one of path is broken (e.g., eth2.5 is down), then the other link will be the active path for VLAN2 and VLAN3. If that link is recovered (e.g., eth2.5 is up again), VLAN2 and VLAN3 will use their active link again (Load sharing). DGS-6600 Configuration Guide 152