H3C Technologies H3C S12500-X Series Switches - Manual (Page 13)

7
Path MTU
When encapsulating an Ethernet frame in EVI, the edge device does not modify the Ethernet frame, but
it sets the DF bit in the IP header. For an Ethernet transport network, the total size of an EVI protocol
packet increases by 46 bytes, and the total size of a data packet increases by 38 bytes. Because EVI
does not support path MTU discovery, your EVI deployment must make sure the path MTU of the
transport network is higher than the maximum size of EVI tunneled frames.
Licensing requirements
EVI requires a license. For information about feature licensing, see Fundamentals Configuration Guide.
Prerequisites
Before you can configure EVI, you must perform the following tasks:
1. Set the system operating mode to advanced by using the system-working-mode advance
command.
2. Save the configuration.
3. Delete the binary .mdb next-startup configuration file.
4. Reboot the device.
For more information about setting the system operating mode, see device management in Fundamentals
Configuration Guide.
EVI configuration task list
Perform the following tasks on all edge devices of an EVI network:
Tasks at a glance Remarks
Configuring EVI basic functions :
(Optional.) Configuring a site ID
(Required.) Configuring an EVI tunnel :
• (Required.) Assigning a network ID to the EVI tunnel
• (Required.) Specifying extended VLANs on the EVI tunnel
• (Required.) Configuring ENDP
• (Optional.) Enabling EVI on transport-facing physical interfaces
An EVI tunnel can provide services
for only one EVI network.
All edge devices in an EVI network
must have the same network ID.
An extended VLAN can be
assigned only to one EVI network.
(Optional.) Tuning EVI IS-IS parameters
EVI IS-IS automatically runs on an
EVI tunnel interface immediately
after the interface is created.
You can tune EVI IS-IS parameters
for optimizing network
performance.
(Optional.) Enabling EVI flooding for all destination-unknown frames
Perform this task to flood frames
with unknown MAC addresses to
the EVI tunnel interface.