В качестве примера будем использовать схему, изображенную на рисунке 1:
Рисунок 1 - Схема включения
Запустим RSTP на маршрутизаторе R3, а также сделаем его корневым:
spanning-tree
rstp
bridge-priority 4096 <============= Задаем приоритет устройству.
interface tengigabitethernet 0/0/1
path-cost 50 <=================== Указываем стоимость пути через заданный интерфейс.
exit
interface tengigabitethernet 0/0/2
path-cost 10
exit
exit
exit
На маршрутизаторах R1 и R2 RSTP настраивается аналогичным образом:
spanning-tree
rstp
interface tengigabitethernet 0/0/2
path-cost 20
exit
interface tengigabitethernet 0/0/3
path-cost 50
exit
exit
exit
Проверим состояние RSTP на маршрутизаторе R1:
0/ME5100:R1# show spanning-tree rstp detail
Wed Oct 18 03:36:40 2023
RSTP operates in 802.1D bridge mode <======================= Тип настроенного STP.
Configured hello time is 2 sec, maximum age is default
operational 200/600, forward delay is 15 sec. <============= Таймеры RSTP.
Root ID Address E0:D9:E3:FF:62:00 <============ MAC адрес корневого устройства.
Priority 4096 <========================= Приоритет корневого устройства.
Root port 3
Root hops 2
Path cost 30
Bridge ID Address e0:d9:e3:ff:60:a0<============= MAC адрес устройства.
Priority 32768
Number of topology changes 9, last occurred 904 sec ago.
Port 3 te0/0/2 is Root fwd <================================ Корневой интерфейс.
Port operational status is up
Port path cost is 20, port priority is 128, identifier is 128.3
Designated root E0:D9:E3:FF:62:00 has priority 4096,
designated root cost is 10.
Designated bridge E0:D9:E3:FF:60:C0 has priority 32768.
Designated port is 2
Port in uptime 00h02m25s
Number of transitions to forwarding state: 4
Port state flags: p2p
Port configuration flags:
p2p rootguard false, TCN-guard false, bpduguard false, portfast false.
Port 4 te0/0/3 is Altn blk <=============================== Заблокированный интерфейс.
Port operational status is up
Port path cost is 50, port priority is 128, identifier is 128.4
Designated root E0:D9:E3:FF:62:00 has priority 4096,
designated root cost is 0.
Designated bridge E0:D9:E3:FF:62:00 has priority 4096.
Designated port is 2
Port in uptime 00h02m25s
Number of transitions to forwarding state: 5
Port state flags: p2p
Port configuration flags:
p2p rootguard false, TCN-guard false, bpduguard false, portfast false.
MAC адрес устройства можно посмотреть следующим образом:
0/ME5100:R1# show system Fri Oct 18 03:50:17 2023 System type: Eltex ME5100 carrier router System name: R1 System software: Eltex Network OS for ME5k version 3.6.0.198R System uptime: 2 days, 6 hours, 48 minutes System restarted at: Wed Oct 18 02:13:43 2023 System MAC address: e0:d9:e3:ff:60:a0 <============ MAC адрес устройства. Power supply 1 is not present Power supply 2 is present, status ON System has no active/unconfirmed alarms
Проверим состояние RSTP на маршрутизаторе R3:
0/ME5100:R3# show spanning-tree rstp detail
Wed Oct 18 03:45:25 2023
RSTP operates in 802.1D bridge mode
Configured hello time is 2 sec, maximum age is default
operational 200/600, forward delay is 15 sec.
Root ID Address E0:D9:E3:FF:62:00
Priority 4096
Root port 0
Root hops 0
Path cost 0
Bridge ID Address e0:d9:e3:ff:62:00
Priority 4096
Number of topology changes 7, last occurred 1327 sec ago.
Port 2 te0/0/1 is Dsgn fwd
Port operational status is up
Port path cost is 50, port priority is 128, identifier is 128.2
Designated root E0:D9:E3:FF:62:00 has priority 4096,
designated root cost is 0.
Designated bridge E0:D9:E3:FF:62:00 has priority 4096.
Designated port is 2
Port in uptime 00h02m24s
Number of transitions to forwarding state: 2
Port state flags: p2p
Port configuration flags:
p2p rootguard false, TCN-guard false, bpduguard false, portfast false.
Port 3 te0/0/2 is Dsgn fwd
Port operational status is up
Port path cost is 10, port priority is 128, identifier is 128.3
Designated root E0:D9:E3:FF:62:00 has priority 4096,
designated root cost is 0.
Designated bridge E0:D9:E3:FF:62:00 has priority 4096.
Designated port is 3
Port in uptime 00h02m24s
Number of transitions to forwarding state: 2
Port state flags: p2p
Port configuration flags:
p2p rootguard false, TCN-guard false, bpduguard false, portfast false.