Extreme Networks ExtremeSwitching VDX 6740 - Extreme Networks Inter-Switch Link Trunks

• "DHCP relay" must be disabled since the DHCP server uses the same port number. Enabling and disabling DHCP
automatically toggles "dhcp relay" and forces a switch reboot.
Extreme Networks inter-switch link trunks
In VCS mode, unless specically disabled, inter-switch link (ISL) Extreme Networks trunking between adjacent devices is automatic. All
ports must be in the same port group and must be congured at the same speed. There is a limit of sixteen ports per trunk group. No
separate licensing is required. Refer to the illustrations below for the exact port groups. On the VDX 6740T, ports in groups 3 and 3A, as
well as port groups 4 and 4A, cannot be trunked together. However, these ports can be trunked on the VDX 6740 when the 40 GbE
QSFP ports are congured in breakout mode. VDX 6740T 1GbE ports cannot be trunked.
NOTE
If connections are made to 16 dierent switches, only eight ports will be trunk ports while the other eight ports will be normal
ISL ports.
For instructions on conguring breakout mode and Extreme Networks trunking, refer to the Extreme Network OS Management
Conguration Guide.
FIGURE 2 Port groups of the VDX 6740
1. Trunk Group 1 - 1/10 GbE SFP ports 1-16
2. Trunk Group 2 - 1/10 GbE SFP ports 17-32
3. Trunk Group 3 - 1/10 GbE SFP ports 33-40
4. Trunk group 4 - 1/10 GbE SFP ports 41-48
5. Trunk Group 3A - 40 GbE QSFP ports 49-50
6. Trunk Group 4A - 40 GbE QSFP ports 51-52
FIGURE 3 Port groups of the VDX 6740T
1. Trunk Group 1 - 1/10 GbE BaseT ports 1-16
2. Trunk Group 2 - 1/10 GbE BaseT ports 17-32
3. Trunk Group 3 - 1/10 GbE BaseT ports 33-40
4. Trunk Group 4 - 1/10 GbE BaseT ports 41-48
5. Trunk Group 3A - 40 GbE QSFP ports 49-50
6. Trunk Group 4A - 40 GbE QSFP ports 51-52
NOTE
For the VDX 6740T-1G variant, if you release Dynamic Ports On Demand (DPOD) licenses from any 10GbE ports on a 16-
port trunk congured with static 10G speed, reserve back those licenses, then perform the shutdown and no shutdown
commands on all trunk ports, the trunk bandwidth will not restore to the maximum 160 Gbps.
Product features
ExtremeSwitching VDX 6740 Hardware Installation Guide
16 9036108-00