Netgear XCM8806 Chassis User Manual - Page 611
Configuring Unicast Routing, Troubleshooting: ECMP Table-Full Messages
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NETGEAR 8800 User Manual Troubleshooting: ECMP Table-Full Messages 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: 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 on page 612 • Adding a Default Route or Gateway on page 612 • Configuring Static Routes on page 612 • Configuring the Relative Route Priority on page 613 • Configuring Hardware Routing Table Usage on page 613 • Configuring IP Route Sharing on page 613 • Configuring Route Compression on page 614 • Configuring Static Route Advertisement on page 614 Chapter 20. IPv4 Unicast Routing | 611
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