D-Link DGS-6600-48T Configuration Guide - Page 156
Topology Changes Count, A: Auto, P
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Volume 3-Layer 2 Configurations / Chapter 14-Spanning Tree Protocol (STP) Configuration Configuration Examples DGS-6600:15#show spanning-tree Bridge is not in STP or RSTP version! DGS-6600:15#show spanning-tree mst Spanning tree : Enabled, Mode : MSTP Forwarding BPDU : Disabled Operational : Forward delay 15, Max age 20 Configured : Forward delay 15, Max age 20 Max hops 20, Transmit Hold count 6 >>>>> MST0 vlans mapped: 1-2,4-4094 Bridge address: 06-0b-00-27-00-00 , Priority: 32768 (32768 sysid 0) Designated Root: address:00-01-02-03-04-00 , Priority: 4096 (4096 sysid 0) Root port : eth2.5 , External Root path cost: 0 Regional Root : address:00-01-02-03-04-00 , Priority: 4096 (4096 sysid 0) Internal Root path cost: 20000 Designated Bridge : address:00-01-02-03-04-00 , Priority: 4096 (4096 sysid 0) Topology Changes Count : 3 codes - F : Fast forwarding on the port is 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 >>>>> MST1 vlans mapped: 3 Bridge address: 06-0b-00-27-00-00 , Priority: 32769 (32768 sysid 1) Regional Root : address:00-01-02-03-04-00 , Priority: 4097 (4096 sysid 1) Internal Root path cost: 20000 Designated Bridge : address:00-01-02-03-04-00 , Priority: 4097 (4096 sysid 1) Topology Changes Count : 3 Remaining Hops : 19 codes - F : Fast forwarding on the port is enabled Configured link type : A: Auto , P: point to point , S: shared Priority Link Interface Role State Cost .Port Type Edge FA eth2.3 Designated Forwarding 200000 128.67 P2P Edge A eth2.5 Alternate Discarding 20000 128.69 P2P None-Edge A eth2.6 Root Forwarding 20000 128.70 P2P None-Edge VLAN2 PC ping each other and observe the traffic is forwarded in path via eth2.5. VLAN3 PC ping each other and observe the traffic is forwarded in path via eth2.6. Link down eth2.5 cable. After few seconds (3-7 seconds), we can observe the Ping traffic between PCs for VLAN2 and VLAN3 all forwarded in active link (e.g., eth2.6), Re-plug the eth2.5 cable again. After few seconds, we can observe the PC ping traffic uses it's own link again. DGS-6600 Configuration Guide 156