【正文】 入命令：(1) show spanningtreeS3500Ashow spanningtree VLAN0001 Spanning tree enabled protocol ieee Root ID Priority 32769 Address Cost 19 Port 3(FastEther0/3) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32769 (priority 32768 sysidext 1) Address Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 20Interface Role Sts Cost Type Fa0/1 Desg FWD 19 P2pFa0/2 Desg FWD 19 P2pFa0/3 Root FWD 19 P2p(2) show ip route S3500Ashow ip route Codes: C connected, S static, I IGRP, R RIP, M mobile, B BGP D EIGRP, EX EIGRP external, O OSPF, IA OSPF inter area N1 OSPF NSSA external type 1, N2 OSPF NSSA external type 2 E1 OSPF external type 1, E2 OSPF external type 2, E EGP i ISIS, L1 ISIS level1, L2 ISIS level2, ia ISIS inter area * candidate default, U peruser static route, o ODR P periodic downloaded static routeGateway of last resort is not set , 2 subsC is directly connected, FastEther0/22C is directly connected, Portchannel 1 , 2 subsC is directly connected, FastEther0/23C is directly connected, FastEther0/24R [120/1] via , 00:00:04, FastEther0/22在 S3500B 上輸入命令：(1) show spanningtreeS3500Bshow spanningtree VLAN0001 Spanning tree enabled protocol ieee Root ID Priority 32769 Address Cost 19 Port 24(FastEther0/24) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32769 (priority 32768 sysidext 1) Address Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 20Interface Role Sts Cost Type Fa0/24 Root FWD 19 P2p(2) show ip interfaceS3500Bshow ip interface FastEther0/1 is up, line protocol is up Inter protocol processing disabledFastEther0/2 is up, line protocol is up Inter protocol processing disabledFastEther0/3 is down, line protocol is down Inter protocol processing disabledFastEther0/4 is down, line protocol is down Inter protocol processing disabledFastEther0/5 is down, line protocol is down Inter protocol processing disabledFastEther0/6 is down, line protocol is down Inter protocol processing disabledFastEther0/7 is down, line protocol is down Inter protocol processing disabledFastEther0/8 is down, line protocol is down Inter protocol processing disabledFastEther0/9 is down, line protocol is down Inter protocol processing disabledFastEther0/10 is down, line protocol is down Inter protocol processing disabledFastEther0/11 is down, line protocol is down Inter protocol processing disabledFastEther0/12 is down, line protocol is down Inter protocol processing disabledFastEther0/13 is down, line protocol is down Inter protocol processing disabledFastEther0/14 is down, line protocol is down Inter protocol processing disabledFastEther0/15 is down, line protocol is down Inter protocol processing disabledFastEther0/16 is down, line protocol is down Inter protocol processing disabledFastEther0/17 is down, line protocol is down Inter protocol processing disabledFastEther0/18 is down, line protocol is down Inter protocol processing disabledFastEther0/19 is down, line protocol is down Inter protocol processing disabledFastEther0/20 is down, line protocol is down Inter protocol processing disabledFastEther0/21 is down, line protocol is down Inter protocol processing disabledFastEther0/22 is down, line protocol is down Inter protocol processing disabledFastEther0/23 is down, line protocol is down Inter protocol processing disabledFastEther0/24 is up, line protocol is up Inter protocol processing disabledGigabitEther0/1 is down, line protocol is down Inter protocol processing disabledGigabitEther0/2 is down, line protocol is down Inter protocol processing disabledVlan1 is administratively down, line protocol is down Inter protocol processing disabledPortchannel 1 is up, line protocol is up Inter protocol processing disabled(3) show ip routeS3500Bshow ip route Codes: C connected, S static, I IGRP, R RIP, M mobile, B BGP D EIGRP, EX EIGRP external, O OSPF, IA OSPF inter area N1 OSPF NSSA external type 1, N2 OSPF NSSA external type 2 E1 OSPF external type 1, E2 OSPF external type 2, E EGP i ISIS, L1 ISIS level1, L2 ISIS level2, ia ISIS inter area * candidate default, U peruser static route, o ODR P periodic downloaded static routeGateway of last resort is not set , 1 subsC is directly connected, Portchannel 1在 S2900 上輸入命令：(1) show vlanS2900show vlan VLAN Name Status Ports 1 default active Fa0/1, Fa0/2, Fa0/4, Fa0/16 Fa0/17, Fa0/18, Fa0/19, Fa0/20 Fa0/21, Fa0/22, Fa0/231002 fddidefault act/unsup 1003 tokenringdefault act/unsup 1004 fddidefault act/unsup 1005 trdefault act/unsup VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2 1 e 100001 1500 0 01002 fddi 101002 1500