switchport mode trunk
switchport nonegotiateНа некоторых модулях поддержка ISL убрана сто лет назад, проверить можно командой:
sh interfaces gigabitEthernet x/y capabilities:
Trunk encap. type: 802.1Q
Trunk mode: on,off,desirable,nonegotiate
Trunk encap. type: 802.1Q,ISL
Trunk mode: on,off,desirable,nonegotiate
также рекомендовал бы почитать про архитектуру модулей - на многих порты ДАЖЕ НА ОДНОМ МОДУЛЕ не равнозначны как по функционалу, так и по переподписке:
2 18 1000BaseX (GBIC) WS-X4418-GB JAE0931H5J8
sh int gigabitEthernet 2/1 capabilities
Model: WS-X4418-GB-Gbic
Type: No Gbic
Speed: 1000
Duplex: full
Auto-MDIX: no
Trunk encap. type: 802.1Q,ISL
Trunk mode: on,off,desirable,nonegotiate
Channel: yes
Broadcast suppression: percentage(0-100), hw
Flowcontrol: rx-(off,on,desired),tx-(off,on,desired)
VLAN Membership: static, dynamic
Fast Start: yes
CoS rewrite: yes
ToS rewrite: yes
Inline power: no
SPAN: source/destination
UDLD: yes
Link Debounce: no
Link Debounce Time: no
Port Security: yes
Dot1x: yes
Maximum MTU: 9198 bytes (Jumbo Frames)
Multiple Media Types: no
Diagnostic Monitoring: N/A
Queuing: rx-(N/A), tx-(1p3q1t, Sharing/Shaping)
sh int gigabitEthernet 2/3 capabilities
Model: WS-X4418-GB-Gbic
Type: No Gbic
Speed: 1000
Duplex: full
Auto-MDIX: no
Trunk encap. type: 802.1Q
Trunk mode: on,off,desirable,nonegotiate
Channel: yes
Broadcast suppression: percentage(0-100), hw
Flowcontrol: rx-(off,on,desired),tx-(off,on,desired)
VLAN Membership: static, dynamic
Fast Start: yes
CoS rewrite: yes
ToS rewrite: yes
Inline power: no
SPAN: source/destination
UDLD: yes
Link Debounce: no
Link Debounce Time: no
Port Security: yes
Dot1x: yes
Maximum MTU: 1500 bytes
Multiple Media Types: no
Diagnostic Monitoring: N/A
Queuing: rx-(N/A), tx-(1p3q1t, Sharing/Shaping)
С наступающим!