
Configuring Enterprise Edge Resources 47
P0911588 Issue 01 Enterprise Edge 2.0 Programming Operations Guide
3. Set your global LAN parameters according to the following table:
Guidelines to configure LAN to LAN traffic smoothing.
Note: The settings shown in the table above ensure data routing uses a maximum
of 60 to 70 percent CPU cycles (Celeron 366MHz processor).
Note: If the LAN to WAN link speed is 10 mbps, selecting higher traffic
smoothing parameters has no impact on packet forwarding, which the
system still performs at a link speed of 10 mbps.
Configuring a LAN interface
LAN1
To configure LAN1 or any other LAN interface:
1. Click the LAN navigation key to expand the navigation tree.
The available LAN interfaces appear.
Attribute Description
Fast Routing
(Between LANs)
Allows you to enable or disable fast routing to improve LAN-to-LAN
routing performance. This feature is for an Enterprise Edge system equipped
with two LAN cards. At the same link speed, a smaller packet size means
more packets to forward. Use a lower traffic threshold. For more
information on Fast Routing, see
Guidelines to configure LAN to LAN traffic
smoothing. Permitted values: Enabled or Disabled
Default: Disabled
Decrement TTL When Fast Routing is enabled, Decrement TTL lets you decrement the time-
to-live (TTL) value in the IP header of packets as they travel from LAN to
LAN. Decrement TTL lets you increase processing time for each fast-routed
IP packet, which reduces CPU cycles. This feature is used when other
routers or special applications on the network connect to the LAN interfaces.
Permitted Values: Enabled or Disabled
Default: Disabled
Traffic Smoothing
(In Mbps)
Lets you set the rate, in Mbps, at which the LAN driver receives packets
from the LAN interface. The main purpose of this feature is to limit the
number of host CPU cycles spent on LAN-to-WAN packet forwarding.
Normally, LAN drivers operate at link speed, which implies that the driver
forwards packets as fast as possible until there is no packet in the receiving
buffer.
Permitted values: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, Disabled
Default: 40
64 bytes 128 bytes 256 bytes 512 bytes 1024 bytes 1500 bytes
Fast Routing
enabled
40 mbps 50 mbps 50 mbps 50 mbps Not needed Not needed
Fast Routing
disabled
or
LAN-to-WAN
routing
10 mbps 15 mbps 30 mbps 50 mbps 50 mbps 50 mbps
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