Netgear XCM8806 - 8800 SERIES 6-SLOT CHASSIS SWITCH ユーザーズマニュアル

If the ECMP table is full, no new gateway sets can be added, and IP forwarding is still done in 
hardware through one of the following:

For platforms that allow a gateway set entry to support multiple subnets, forwarding can 

be done using an existing gateway set that is a partial subset of the unavailable gateway 
set. If the unavailable gateway set consists of N gateways, the subset used could include 
a range of gateways from N-1 gateways down to a single gateway. For example, if the 
ECMP table does not have room for a new gateway set using gateways E, F, G, and H, a 
partial subset such as EFG, EF, or E will be used.

For platforms that require one gateway set entry per subnet, forwarding is done through a 

single gateway.

On NETGEAR 8800 switches, an ECMP table-full condition produces the following message:

<Info:Kern.IPv4FIB.Info> Slot-1: IPv4 route can not use sharing on all its 

gateways.  Hardware ECMP Table full.  Packets are HW forwarded across a subset 

of gateways.   (Logged at most once per hour.)

If the ECMP table-full message appears, consider the following remedies:

See the XCM8800 Release Notes for information on the total combinations of gateway 

sets supported for IP route sharing on different platforms.

Reduce the number of gateways adjacent to the switch used for IP route sharing.

Monitor the switch to see if the condition is transient. For example, if the number of ECMP 

table entries temporarily increases due to a network event and then returns to within the 
supported range, a permanent change might not be required.

Determine if IP route sharing to all gateways is required. Since traffic is still being 

forwarded in hardware using one or more gateways, the condition may be acceptable.

Configuring Unicast Routing

This section describes the following tasks:

•     Configuring Basic Unicast Routing 

•     Adding a Default Route or Gateway 

•     Configuring Static Routes 

•     Configuring the Relative Route Priority 

•     Configuring Hardware Routing Table Usage 

•     Configuring IP Route Sharing 

•     Configuring Route Compression 

•     Configuring Static Route Advertisement