H3C Technologies H3C S10500 Series Switches - Manual (Page 14)

7
Placement of Layer 3 gateways
For the hosts in an extended VLAN at a site, their Layer 3 gateway must be on the edge device at the
local site rather than a remote site.
Selective flood
Selective flood enables an edge device to send a multicast or unknown unicast frame out of an EVI tunnel
interface.
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.
Configuration restrictions and guidelines
For EVI to operate correctly, follow the restrictions and guidelines in this section.
Licensing requirements
EVI requires a license. For information about feature licensing, see Fundamentals Configuration Guide.
Hardware requirements
When you configure EVI, follow these hardware restrictions:
• You can enable EVI only on interfaces on the following cards:
{
EC cards.
{
SG cards.
{
LSUM2GP44TSSE0.
{
LSUM2GP24TSSE0.
{
LSUM2GT24PTSSE0.
{
LSUM2GT24TSSE0.
{
LSUM2GT48SE0.
{
LSUM2GV48SE0.
{
LSU1CGC2SE0.
Feature compatibility requirements
When you use EVI in conjunction with other features, follow these restrictions and guidelines: