Netgear XCM8806 - 8800 SERIES 6-SLOT CHASSIS SWITCH 사용자 설명서
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Chapter 23. RIPng
NETGEAR 8800 User Manual
Routing Table
The routing table in a router using RIPng contains an entry for every known destination
network. Each routing table entry contains the following information:
network. Each routing table entry contains the following information:
•
IP address and prefix length of the destination network
•
Metric (hop count) to the destination network
•
IP address of the next hop router, if the destination is not directly connected
•
Interface for the next hop
•
Timer that tracks the amount of time since the entry was last updated
•
A flag that indicates if the entry is a new one since the last update
•
The source of the route, for example, static, RIPng, OSPFv3, etc.
The router exchanges an update message with each neighbor every 30 seconds (default
value), or when there is a change to the overall routed topology (also called triggered
updates). If a router does not receive an update message from its neighbor within the route
timeout period (180 seconds by default), the router assumes the connection between it and
its neighbor is no longer available.
value), or when there is a change to the overall routed topology (also called triggered
updates). If a router does not receive an update message from its neighbor within the route
timeout period (180 seconds by default), the router assumes the connection between it and
its neighbor is no longer available.
Split Horizon
Split horizon is a scheme for avoiding problems caused by including routes in updates sent to
the router from which the route was learned. Split horizon omits routes learned from a
neighbor in updates sent to that neighbor.
the router from which the route was learned. Split horizon omits routes learned from a
neighbor in updates sent to that neighbor.
Poison Reverse
Like split horizon, poison reverse is a scheme for eliminating the possibility of loops in the
routed topology. In this case, a router advertises a route over the same interface that supplied
the route, but the route uses a hop count of 16, which defines that router as unreachable.
routed topology. In this case, a router advertises a route over the same interface that supplied
the route, but the route uses a hop count of 16, which defines that router as unreachable.
Triggered Updates
Triggered updates occur whenever a router changes the metric for a route. The router is
required to send an update message immediately, even if it is not yet time for a regular
update message to be sent. This generally results in faster convergence, but may also result
in more RIPng-related traffic.
required to send an update message immediately, even if it is not yet time for a regular
update message to be sent. This generally results in faster convergence, but may also result
in more RIPng-related traffic.
Route Advertisement of VLANs
Virtual LANs (VLANs) that are configured with an IP address but are configured to not route
IP or are not configured to run RIP, do not have their subnets advertised by RIP. RIP
advertises only those VLANs that are configured with an IP address, are configured to route
IP, and run RIP.
IP or are not configured to run RIP, do not have their subnets advertised by RIP. RIP
advertises only those VLANs that are configured with an IP address, are configured to route
IP, and run RIP.