Path Mtu Table; Chapter 44 Path Mtu Table; Path Mtu Overview; Viewing The Path Mtu Table - ZyXEL Communications GS1920 series User Manual

This chapter introduces the IPv6 Path MTU table.

44.1 Path MTU Overview

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.

44.2 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 254 Management > Path MTU Table
The following table describes the labels in this screen.
Table 172 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/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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Path MTU Table

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