Path Mtu Table; Chapter 39 Path Mtu Table; Path Mtu Overview; Viewing The Path Mtu Table - ZyXEL Communications GS1915 Series User Manual

39.1 Path MTU Overview

This chapter introduces the IPv6 Path MTU table.
The largest size (in bytes) of a packet that can be transferred over a data link is called the maximum
transmission unit (MTU). The Switch uses Path MTU Discovery to discover Path MTU (PMTU), that is, the
minimum link MTU of all the links in a path to the destination. If the Switch receives an ICMPv6 Packet Too
Big error message after sending a packet, it fragments the next packet according to the suggested MTU
in the error message.

39.2 Viewing the Path MTU Table

Use this screen to view IPv6 path MTU information on the Switch. Click Management > Path MTU Table in
the navigation panel to display the screen as shown.
Figure 218 Management > Path MTU Table
The following table describes the labels in this screen.
Table 155 Management > Path MTU Table
LABEL
Path MTU
aging time
Index
Destination
Address
MTU
Expire
DESCRIPTION
This field displays how long an entry remains in the Path MTU table before it ages out and needs to
be relearned.
This field displays the index number of each entry in the table.
This field displays the destination IPv6 address of each path or entry.
This field displays the maximum transmission unit of the links in the path.
This field displays how long (in minutes) an entry can still remain in the Path MTU table before it
ages out and needs to be relearned.
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