Owner's Manual

600 | Chapter 20. IPv4 Unicast Routing
NETGEAR 8800 User Manual
• When a node contains only a multicast route.
Route compression is applied to unicast routes only. If a node contains only a multicast
route, the compression algorithm is not applied to the node. Therefore multicast nodes
are considered as nodes with no best unicast routes as shown in
Table 59.
ECMP Handling When IP Route Sharing Is Enabled
The nodes that have ECMP table entries are compressed only if the following conditions are
met; otherwise, potential sub-optimal forwarding occurs:
• The number of ECMP gateways for a given node must match the number of ECMP
gateways in its parent node.
• A given node’s set of gateways must match its parent’s set of gateways.
Table 60 shows how compression is applied for the nodes with ECMP table entries when IP
route sharing is enabled. Sample routes with ECMP table entries are taken for illustration.
The Reason field in the table provides information about why the compression is applied or
not applied for the node.
Table 58. Route Manager’s Table When There Is No Best Route for a Node
Prefix Gateway Number of best paths Compressed?
192.0.0.0/8 10.203.174.68 1 No
192.168.0.0/16 10.203.174.68 0 No
192.168.224.0/24 10.203.174.68 1 No
192.168.225.0/24 10.203.174.68 1 No
Table 59. Route Manager’s Table When a Node Contains Only a Multicast Route
Prefix Gateway Unicast/Multicast Compressed?
192.0.0.0/8 10.203.174.68 Unicast Route No
192.168.0.0/16 10.203.174.68 Multicast Route No
192.168.224.0/24 10.203.174.68 Unicast Route No
192.168.225.0/24 10.203.174.68 Unicast Route No