ZyXEL VES1724-56 User Guide - Page 358
Prefix List
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Chapter 46 IPv6 Cache Table 169 IPv6 Cache > Neighbor Cache (continued) LABEL State DESCRIPTION This field displays whether the neighboring IPv6 interface is reachable. In IPv6, "reachable" means an IPv6 packet can be correctly forwarded to a neighboring node (host or router) and the neighbor can successfully receive and handle the packet. The available options in this field are: Reachable: The interface of the neighboring device is reachable. (The Switch has received a response to its neighbor solicitation.) Stale: The last reachable time has expired or the Switch received an unrequested advertisement that updates the cached link-layer address from the neighboring interface. Delay: A packet is being sent to the neighboring interface in Stale state.The Switch delays sending request packets for a short time to give upper-layer protocols a chance to determine reachability. If no reachability confirmation is received within the delay timer, the Switch sends a neighbor solicitation and changes the state to Probe. Probe: The Switch is sending neighbor solicitations and waiting for the neighbor's response. Invalid: The neighbor address is an invalid IPv6 address. Unknown: The status of the neighboring interface can not be determined. Flags Expire Incomplete: Address resolution is in progress and the link-layer address of the neighbor has not yet been determined (see RFC 4861). The interface of the neighboring device did not give a complete response. This displays R when the neighboring device is a router. Otherwise, this field is blank to indicate the neighboring device is a host. This displays how long (hhhmmmsss) an address can be used before it expires. When an address is manually configured, it displays permanent (never expires). 46.3 Prefix List Click Management > IPv6 Cache in the navigation panel and then the Prefix link to open this screen. Use this screen to view the list of on-link prefixes. The prefixes are used to determine whether an IP address is on the same link as the Switch or should be reached through a router. Figure 231 IPv6 Cache > Prefix List 358 VES1724-56 User's Guide
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