Command Line Interface Reference Guide > The Configuration Menu > /cfg/l3/tunnel <ID> IP Tunnel Menu
/cfg/l3/tunnel <ID>
IP Tunnel Menu
Alteon supports back-end tunneling in order to be able to communicate with servers in Direct Server Response (DSR) deployments over GRE, IP-in-IP or VXLAN tunnels. Mixing tunnel methods on the same device is also supported.
In DSR topology, the client's request goes through the Alteon while the response goes directly to the client. Using that feature, both traffic and Health-Checks are sent towards the servers over tunnels. This allows customers to locate the servers in a different network than Alteon's, and to transfer the client's source IP address as is.
Both IPv4 and IPv6 tunnels are supported.
In order to ensure that the tunneled packet has the same QoS treatment, the TOS byte is preserved from the original packet.
Note: The tunnel feature has the following limitations:
*Layer 3 tunnels are not supported on Alteon VA running in TUN TAP mode.
*Tunnels are supported only on the data ports (including management over data port); tunnels are not supported on the management port.
*The MTUs of all the network elements between the tunnel endpoints should not be lower than the MTU of the endpoints.
Note: On the Alteon 5208 and 6420 platforms the load of all the SPs won't be balanced, and one SP will be significantly higher than the others.
This is because the HW hash is being performed on the outer header of the packet and not on its inner header, and as a result, all the tunnel packets are received on a single SP (since the external header destination is the same for all the packets).
Once the packet is received by the destination SP, it opens the packet and performs the hash on the inner packet header, and transferring the packet to the correct destination SP.
 
[Tunnel 1 Menu]
name - Set descriptive tunnel name
ipver - Set IP version
localinn - Set tunnel local inner address
local - Set tunnel local address
remoteadr - Set tunnel remote address
protocol - Set Tunnel protocol
gre - GRE proocol Menu
     tnlvxlan - VXLAN protocol Menu
ena - Enable tunnel
dis - Disable tunnel
del - Delete tunnel
cur - Display current tunnel configuration
 
IP Tunnel configuration Options (/cfg/l3/tunnel) 
Command Syntax and Usage
name
 
Specifies a descriptive tunnel name.
Valid value: alphanumeric, up to 32 characters.
ipver
 
Sets the IP version.
Values: V4, V6
localinn
 
Sets the tunnel local IP inner address.
Enter new interface ID to be used as the inner address.
Values: 1-256
local
 
Sets the tunnel local IP address: floating ID (default), VR ID or IP interface number.
Values: floating, if, vr
Note: In order to maintain same tunnel functionality upon failover, it is required to set the local address as either floating ID or VR.
remoteadr
 
Sets the tunnel remote IP address.
protocol
 
Sets the tunnel protocol: GRE or IPinIP.
If GRE is selected, a GRE key may be required using the GRE command.
Values: gre, ipip, disable
tnlvxlan
 
Displays the VXLAN Protocol menu. To view this menu, see /cfg/l3/tunnel <ID>/tnlvxlan VXLAN Protocol Menu.
gre
 
Displays the GRE Protocol menu. To view this menu, see /cfg/l3/tunnel <ID>/gre GRE Protocol Menu.
matchegr
 
Sets the tunnel egress matching criteria (IP address).
Traffic that matches will be encapsulated over the particular tunnel.
ena
 
Enables the tunnel.
dis
 
Disables the tunnel.
del
 
Deletes the tunnel.
cur
 
Displays the current tunnel configuration.