09-30-2020 01:32 PM
Hi, guys. I can not understand. On the Level 2 switch, for instance 0 root is indicated correctly, but for the rest instances the Level 2 switch points to itself.
Why is that? Is this correct?
My configuration
Cisco WS-C3750X-48P iOS 12.2(55)SE13
switch Level 1
spanning-tree mode mst spanning-tree logging spanning-tree extend system-id spanning-tree pathcost method long ! spanning-tree mst configuration name MSTP-R01 revision 1 instance 1 vlan 700 instance 2 vlan 101, 1210, 1220-1223, 1230, 1240, 1250 instance 3 vlan 1300, 1310, 1320, 1330, 1399 instance 4 vlan 100 instance 5 vlan 1010, 1030, 1040 instance 6 vlan 2020 instance 7 vlan 500 instance 8 vlan 600 instance 9 vlan 1110, 1120 instance 10 vlan 10, 310, 320, 330, 340 ! spanning-tree mst 0-10 priority 28672
Cisco WS-C3750-48P 12.2(55)SE10
Level 2
spanning-tree mode mst spanning-tree logging spanning-tree extend system-id spanning-tree pathcost method long ! spanning-tree mst configuration name MSTP-R01 revision 1 instance 1 vlan 700 instance 2 vlan 101, 1210, 1220-1223, 1230, 1240, 1250 instance 3 vlan 1300, 1310, 1320, 1330 instance 4 vlan 100 instance 5 vlan 1010, 1030, 1040 instance 6 vlan 2020 instance 7 vlan 500 instance 8 vlan 600 instance 9 vlan 1110, 1120 instance 10 vlan 10, 310, 320, 330, 340 ! spanning-tree mst 0-10 priority 61440
Level 2 show spanning-tree
sw-kv-net-as43#sho spanning-tree mst 0 ##### MST0 vlans mapped: 1-9,11-99,102-309,311-319,321-329,331-339 341-499,501-599,601-699,701-1009,1011-1029 1031-1039,1041-1109,1111-1119,1121-1209 1211-1219,1224-1229,1231-1239,1241-1249 1251-1299,1301-1309,1311-1319,1321-1329 1331-2019,2021-4094 Bridge address 0015.c6dc.cc80 priority 61440 (61440 sysid 0) Root address 44d3.ca5b.e600 priority 28672 (28672 sysid 0) port Gi1/0/1 path cost 20000 Regional Root this switch Operational hello time 2 , forward delay 15, max age 20, txholdcount 6 Configured hello time 2 , forward delay 15, max age 20, max hops 20 Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- -------------------------------- Gi1/0/1 Root FWD 20000 128.1 P2p Bound(RSTP) Gi1/0/3 Desg FWD 20000 128.27 P2p Fa1/0/43 Desg FWD 200000 128.47 P2p Edge Fa1/0/44 Desg FWD 200000 128.48 P2p Edge Fa1/0/45 Desg FWD 200000 128.49 P2p Edge Fa1/0/46 Desg FWD 200000 128.50 P2p Edge Fa1/0/47 Desg FWD 200000 128.51 P2p Edge Fa1/0/48 Desg FWD 200000 128.52 P2p Edge sw-kv-net-as43#sho spanning-tree mst 1 ##### MST1 vlans mapped: 700 Bridge address 0015.c6dc.cc80 priority 61441 (61440 sysid 1) Root this switch for MST1 Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- -------------------------------- Gi1/0/1 Mstr FWD 20000 128.1 P2p Bound(RSTP) sw-kv-net-as43#sho spanning-tree mst 2 ##### MST2 vlans mapped: 101,1210,1220-1223,1230,1240,1250 Bridge address 0015.c6dc.cc80 priority 61442 (61440 sysid 2) Root this switch for MST2 Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- -------------------------------- Gi1/0/1 Mstr FWD 20000 128.1 P2p Bound(RSTP)
09-30-2020 01:59 PM
If you looking at VLAN 700, they are not allowed in the port-channel so they become locally root bridge?
is this what you looking for, sorry if i miss understood your question here?
also, post Level 1 spanning-tree output to understand better
09-30-2020 02:23 PM
Sorry for my english. Why are 1, 2, 3 instances has different root at Level 2 switch?
Level 1 sho spanning-tree mst 0,1,2
sw-kv04-net-cr03# sw-kv04-net-cr03#terminal length 0 sw-kv04-net-cr03#terminal width 132 sw-kv04-net-cr03#sho spanning-tree mst 0,1,2 ##### MST0 vlans mapped: 1-9,11-99,102-309,311-319,321-329,331-339 341-499,501-599,601-699,701-1009,1011-1029 1031-1039,1041-1109,1111-1119,1121-1209 1211-1219,1224-1229,1231-1239,1241-1249 1251-1299,1301-1309,1311-1319,1321-1329 1331-1398,1400-2019,2021-4094 Bridge address 44d3.ca5b.e600 priority 28672 (28672 sysid 0) Root this switch for the CIST Operational hello time 2 , forward delay 15, max age 20, txholdcount 6 Configured hello time 2 , forward delay 15, max age 20, max hops 20 Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- -------------------------------- Gi1/0/1 Desg FWD 20000 128.1 P2p Gi1/0/2 Desg FWD 20000 128.2 P2p Pre-STD Gi1/0/3 Desg FWD 20000 128.3 P2p Pre-STD Gi1/0/4 Desg FWD 20000 128.4 P2p Pre-STD Gi1/0/5 Desg FWD 20000 128.5 P2p Pre-STD Gi1/0/6 Desg FWD 20000 128.6 P2p Pre-STD Gi1/0/7 Desg FWD 20000 128.7 P2p Pre-STD Gi1/0/8 Desg FWD 20000 128.8 P2p Pre-STD Gi1/0/9 Desg FWD 20000 128.9 P2p Pre-STD Gi1/0/13 Desg FWD 20000 128.13 P2p Pre-STD Gi1/0/14 Desg FWD 20000 128.14 P2p Pre-STD Gi1/0/15 Desg FWD 20000 128.15 P2p Pre-STD Gi1/0/16 Desg FWD 20000 128.16 P2p Pre-STD Gi1/0/17 Desg FWD 20000 128.17 P2p Pre-STD Gi1/0/18 Desg FWD 20000 128.18 P2p Pre-STD Gi1/0/19 Desg FWD 20000 128.19 P2p Pre-STD Gi1/0/20 Desg FWD 20000 128.20 P2p Pre-STD Gi1/0/21 Desg FWD 20000 128.21 P2p Pre-STD Gi1/0/22 Desg FWD 20000 128.22 P2p Pre-STD Gi1/0/23 Desg FWD 20000 128.23 P2p Pre-STD Gi1/0/29 Desg FWD 20000 128.29 P2p Pre-STD Gi1/0/32 Desg FWD 20000 128.32 P2p Pre-STD-Cf Gi1/0/33 Desg FWD 20000 128.33 P2p Edge Pre-STD-Cf Gi1/0/36 Desg FWD 20000 128.36 P2p Gi1/0/38 Desg FWD 20000 128.38 P2p Pre-STD-Cf Gi1/0/42 Desg FWD 20000 128.42 P2p Pre-STD-Cf Te1/1/1 Desg FWD 2000 128.53 P2p Gi2/0/1 Desg FWD 20000 128.55 P2p Gi2/0/2 Desg FWD 20000 128.56 P2p Pre-STD Gi2/0/3 Desg FWD 20000 128.57 P2p Pre-STD Gi2/0/4 Desg FWD 20000 128.58 P2p Pre-STD Gi2/0/5 Desg FWD 20000 128.59 P2p Pre-STD Gi2/0/6 Desg FWD 20000 128.60 P2p Pre-STD Gi2/0/7 Desg FWD 20000 128.61 P2p Pre-STD Gi2/0/8 Desg FWD 20000 128.62 P2p Pre-STD Gi2/0/9 Desg FWD 20000 128.63 P2p Pre-STD Gi2/0/13 Desg FWD 20000 128.67 P2p Pre-STD Gi2/0/14 Desg FWD 20000 128.68 P2p Pre-STD Gi2/0/15 Desg FWD 20000 128.69 P2p Pre-STD Gi2/0/16 Desg FWD 20000 128.70 P2p Pre-STD Gi2/0/18 Desg FWD 20000 128.72 P2p Pre-STD Gi2/0/19 Desg FWD 20000 128.73 P2p Pre-STD Gi2/0/20 Desg FWD 20000 128.74 P2p Pre-STD Gi2/0/21 Desg FWD 20000 128.75 P2p Pre-STD Gi2/0/22 Desg FWD 20000 128.76 P2p Pre-STD Gi2/0/23 Desg FWD 20000 128.77 P2p Pre-STD Gi2/0/24 Desg FWD 20000 128.78 P2p Pre-STD Gi2/0/25 Desg FWD 20000 128.79 P2p Pre-STD Gi2/0/31 Desg FWD 200000 128.85 P2p Pre-STD-Cf Gi2/0/39 Desg FWD 200000 128.93 P2p Pre-STD-Cf Gi2/1/1 Desg FWD 20000 128.103 P2p ##### MST1 vlans mapped: 700 Bridge address 44d3.ca5b.e600 priority 24577 (24576 sysid 1) Root this switch for MST1 Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- -------------------------------- Gi1/0/1 Desg FWD 20000 128.1 P2p Gi1/0/2 Desg FWD 20000 128.2 P2p Pre-STD Gi1/0/3 Desg FWD 20000 128.3 P2p Pre-STD Gi1/0/4 Desg FWD 20000 128.4 P2p Pre-STD Gi1/0/5 Desg FWD 20000 128.5 P2p Pre-STD Gi1/0/6 Desg FWD 20000 128.6 P2p Pre-STD Gi1/0/7 Desg FWD 20000 128.7 P2p Pre-STD Gi1/0/8 Desg FWD 20000 128.8 P2p Pre-STD Gi1/0/9 Desg FWD 20000 128.9 P2p Pre-STD Gi1/0/13 Desg FWD 20000 128.13 P2p Pre-STD Gi1/0/14 Desg FWD 20000 128.14 P2p Pre-STD Gi1/0/15 Desg FWD 20000 128.15 P2p Pre-STD Gi1/0/16 Desg FWD 20000 128.16 P2p Pre-STD Gi1/0/17 Desg FWD 20000 128.17 P2p Pre-STD Gi1/0/18 Desg FWD 20000 128.18 P2p Pre-STD Gi1/0/19 Desg FWD 20000 128.19 P2p Pre-STD Gi1/0/20 Desg FWD 20000 128.20 P2p Pre-STD Gi1/0/21 Desg FWD 20000 128.21 P2p Pre-STD Gi1/0/22 Desg FWD 20000 128.22 P2p Pre-STD Gi1/0/23 Desg FWD 20000 128.23 P2p Pre-STD Gi1/0/29 Desg FWD 20000 128.29 P2p Pre-STD Gi1/0/32 Desg FWD 20000 128.32 P2p Pre-STD-Cf Gi1/0/33 Desg FWD 20000 128.33 P2p Edge Pre-STD-Cf Gi1/0/36 Desg FWD 20000 128.36 P2p Gi1/0/38 Desg FWD 20000 128.38 P2p Pre-STD-Cf Te1/1/1 Desg FWD 2000 128.53 P2p Gi2/0/1 Desg FWD 20000 128.55 P2p Gi2/0/2 Desg FWD 20000 128.56 P2p Pre-STD Gi2/0/3 Desg FWD 20000 128.57 P2p Pre-STD Gi2/0/4 Desg FWD 20000 128.58 P2p Pre-STD Gi2/0/5 Desg FWD 20000 128.59 P2p Pre-STD Gi2/0/6 Desg FWD 20000 128.60 P2p Pre-STD Gi2/0/7 Desg FWD 20000 128.61 P2p Pre-STD Gi2/0/8 Desg FWD 20000 128.62 P2p Pre-STD Gi2/0/9 Desg FWD 20000 128.63 P2p Pre-STD Gi2/0/13 Desg FWD 20000 128.67 P2p Pre-STD Gi2/0/14 Desg FWD 20000 128.68 P2p Pre-STD Gi2/0/15 Desg FWD 20000 128.69 P2p Pre-STD Gi2/0/16 Desg FWD 20000 128.70 P2p Pre-STD Gi2/0/18 Desg FWD 20000 128.72 P2p Pre-STD Gi2/0/19 Desg FWD 20000 128.73 P2p Pre-STD Gi2/0/20 Desg FWD 20000 128.74 P2p Pre-STD Gi2/0/21 Desg FWD 20000 128.75 P2p Pre-STD Gi2/0/22 Desg FWD 20000 128.76 P2p Pre-STD Gi2/0/23 Desg FWD 20000 128.77 P2p Pre-STD Gi2/0/24 Desg FWD 20000 128.78 P2p Pre-STD Gi2/0/25 Desg FWD 20000 128.79 P2p Pre-STD Gi2/0/31 Desg FWD 200000 128.85 P2p Pre-STD-Cf Gi2/1/1 Desg FWD 20000 128.103 P2p ##### MST2 vlans mapped: 101,1210,1220-1223,1230,1240,1250 Bridge address 44d3.ca5b.e600 priority 28674 (28672 sysid 2) Root this switch for MST2 Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- -------------------------------- Gi1/0/1 Desg FWD 20000 128.1 P2p Gi1/0/2 Desg FWD 20000 128.2 P2p Pre-STD Gi1/0/3 Desg FWD 20000 128.3 P2p Pre-STD Gi1/0/4 Desg FWD 20000 128.4 P2p Pre-STD Gi1/0/5 Desg FWD 20000 128.5 P2p Pre-STD Gi1/0/6 Desg FWD 20000 128.6 P2p Pre-STD Gi1/0/7 Desg FWD 20000 128.7 P2p Pre-STD Gi1/0/8 Desg FWD 20000 128.8 P2p Pre-STD Gi1/0/9 Desg FWD 20000 128.9 P2p Pre-STD Gi1/0/13 Desg FWD 20000 128.13 P2p Pre-STD Gi1/0/14 Desg FWD 20000 128.14 P2p Pre-STD Gi1/0/15 Desg FWD 20000 128.15 P2p Pre-STD Gi1/0/16 Desg FWD 20000 128.16 P2p Pre-STD Gi1/0/17 Desg FWD 20000 128.17 P2p Pre-STD Gi1/0/18 Desg FWD 20000 128.18 P2p Pre-STD Gi1/0/19 Desg FWD 20000 128.19 P2p Pre-STD Gi1/0/20 Desg FWD 20000 128.20 P2p Pre-STD Gi1/0/21 Desg FWD 20000 128.21 P2p Pre-STD Gi1/0/22 Desg FWD 20000 128.22 P2p Pre-STD Gi1/0/23 Desg FWD 20000 128.23 P2p Pre-STD Gi1/0/29 Desg FWD 20000 128.29 P2p Pre-STD Gi1/0/32 Desg FWD 20000 128.32 P2p Pre-STD-Cf Gi1/0/36 Desg FWD 20000 128.36 P2p Gi1/0/38 Desg FWD 20000 128.38 P2p Pre-STD-Cf Gi1/0/42 Desg FWD 20000 128.42 P2p Pre-STD-Cf Te1/1/1 Desg FWD 2000 128.53 P2p Gi2/0/1 Desg FWD 20000 128.55 P2p Gi2/0/2 Desg FWD 20000 128.56 P2p Pre-STD Gi2/0/3 Desg FWD 20000 128.57 P2p Pre-STD Gi2/0/4 Desg FWD 20000 128.58 P2p Pre-STD Gi2/0/5 Desg FWD 20000 128.59 P2p Pre-STD Gi2/0/6 Desg FWD 20000 128.60 P2p Pre-STD Gi2/0/7 Desg FWD 20000 128.61 P2p Pre-STD Gi2/0/8 Desg FWD 20000 128.62 P2p Pre-STD Gi2/0/9 Desg FWD 20000 128.63 P2p Pre-STD Gi2/0/13 Desg FWD 20000 128.67 P2p Pre-STD Gi2/0/14 Desg FWD 20000 128.68 P2p Pre-STD Gi2/0/15 Desg FWD 20000 128.69 P2p Pre-STD Gi2/0/16 Desg FWD 20000 128.70 P2p Pre-STD Gi2/0/18 Desg FWD 20000 128.72 P2p Pre-STD Gi2/0/19 Desg FWD 20000 128.73 P2p Pre-STD Gi2/0/20 Desg FWD 20000 128.74 P2p Pre-STD Gi2/0/21 Desg FWD 20000 128.75 P2p Pre-STD Gi2/0/22 Desg FWD 20000 128.76 P2p Pre-STD Gi2/0/23 Desg FWD 20000 128.77 P2p Pre-STD Gi2/0/24 Desg FWD 20000 128.78 P2p Pre-STD Gi2/0/25 Desg FWD 20000 128.79 P2p Pre-STD Gi2/0/31 Desg FWD 200000 128.85 P2p Pre-STD-Cf Gi2/1/1 Desg FWD 20000 128.103 P2p
09-30-2020 02:32 PM
Port configuration between switches.
Level 1
interface GigabitEthernet2/1/1 description UP-F switchport trunk encapsulation dot1q switchport mode trunk storm-control broadcast level bps 10m storm-control multicast level bps 10m spanning-tree guard root end
Level 2
interface GigabitEthernet1/0/1 description KV04 switchport trunk encapsulation dot1q switchport trunk allowed vlan 1-199,201-4094 switchport mode trunk switchport nonegotiate ip dhcp snooping trust end
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide