Command Line Interface Reference Guide > The Configuration Menu > /cfg/l2 Layer 2 Configuration Menu
/cfg/l2
Layer 2 Configuration Menu
This menu provides commands for grouping multiple physical ports together to aggregate the bandwidth between large-scale network devices.
Trunk groups can provide super-bandwidth and multi-link connections between Alteon or other trunk-capable devices. A trunk group is a group of ports that act together, combining their bandwidth to create a single, larger virtual link. When trunk groups are configured, you can view the state of each port in the various trunk groups. Up to 12 trunk groups can be configured, with the following restrictions:
*Any physical port can belong to no more than one trunk group.
*Up to eight ports can belong to the same trunk group.
*The best performance is achieved when all ports in a trunk are configured for the same speed.
*Trunking Alteons must comply with Cisco EtherChannel technology.
*You cannot configure static ARP entries for static trunk ports.
Global Administrator Layer 2 Menu
[Layer 2 Menu]
mrst - Multiple Spanning Tree/Rapid Spanning Tree Menu
stg - Spanning Tree Menu
mtu - Set Maximum Transmission Unit (MTU)
trunk - Trunk Group Menu
lacp - Link Aggregation Control Protocol Menu
vlan - VLAN Menu
     lldp  - Link Layer Discovery Protocol Menu
team - Port Teaming Menu
     hwbypass - Bypass Menu
cur - Display current Layer 2 parameters
 
Layer 2 Configuration Menu Options (/cfg/l2) 
Command Syntax and Usage
mrst
 
Displays the Multiple Spanning Tree menu. To view this menu, see /cfg/l2/mrst Multiple Spanning Tree Menu.
stg <group number [1-16]>
 
Displays the Spanning Tree Group menu. To view this menu, see /cfg/l2/stg Spanning Tree Group Configuration.
mtu (1500-9216)
 
Specifies the maximum transmission unit (MTU) size for regular Ethernet traffic or for jumbo frames (Ethernet frames with a payload of over 1500 bytes).
To enable jumbo frames, set the MTU value to 9216.
Default: 1500 (the maximum size of a standard Ethernet packet)
Notes
*Jumbo frames are supported on the following Alteon platforms:
Alteon 5208 with 32 GB RAM
Alteon 6024 with 128 GB RAM
Alteon 6420 with 128 GB RAM
Alteon 6420p with 128 GB RAM
Alteon 7612
Alteon 7220
Alteon 8420
Alteon 8820
Alteon VA with RAM greater than 3 GB and DPDK enabled at /cfg/sys/dpdk.
*Before changing the MTU size, you must verify that there are no pending configuration changes. If there are, the new MTU size will be ignored.
*Setting the MTU value above 1500 is possible only when there are no pending configurations, and requires a reboot.
*After you change the MTU size, you will be prompted to approve the platform reboot in order for the configuration changes to take effect. If you do not approve the reboot, the new MTU size will be ignored.
*When a proxy is enabled, modify the Maximum Segment Size in the appropriate TCP policy to 9176 for IPv4, or 9156 for IPv6.
*When running IPV6 management data over data ports while Jumbo frames are enabled, management services such as the following are not supported:
Server health checks
DNS, Syslog, GSLB, ICMP
RADIUS, TACACS, SNMP, SMTP, NTP, TFTP, SCPS
SNMP, SSH, Telnet
When prompted, approve the Alteon reboot.
Set the MTU value according to the following example:
/c/sys/idle 20
apply
save
y
/cfg/l2/mtu 9216
y
Note: You can verify the result of enabling jumbo frames at /cfg/l2/cur.
trunk <trunk group number>
 
Displays the Trunk Group menu. To view this menu, see /cfg/l2/trunk <trunk group number> Trunk Configuration.
Default: enable
lacp
 
Displays the Link Aggregation Control Protocol (LACP) menu. To view this menu, see /cfg/l2/lacp Link Aggregation Control Protocol Menu.
vlan <VLAN number (1-4090)>
 
Displays the VLAN menu. To view this menu, see /cfg/l2/vlan <VLAN number> VLAN Configuration.
lldp
 
Displays the Link Layer Discovery Protocol menu. To view this menu, see /cfg/l2/lldp Link Layer Discovery Protocol Configuration.
team
 
Displays the Port Team menu. This menu only appears in the Global Administrator environment in ADC-VX mode. To view this menu, see /cfg/l2/team <team number> Port Team Configuration.
Default: enable
ntmstg disable|enable
 
Enables or disables Alteon Multiple Spanning Tree Group mode.
Values:
*enable — When Alteon multiple STG mode is enabled, the Alteon implementation of multiple STGs is followed. After setting to enabled, you must reset Alteon with the /boot/reset command.
*disable — When Alteon multiple STG mode is disabled, the Cisco implementation of multiple STGs is followed. The ntmstg-enabled Alteon will not work with Alteon configured for Cisco implementation of Spanning Tree BPDUs.
Default: disable
hwbypass
 
Displays the Bypass menu. To view this menu, see /cfg/l2/hwbypass Bypass Menu.
cur
 
Displays the current Layer 2 parameters.