Chapter 43 Path MTU Table
GS1920 Series User’s Guide
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CHAPTER 43
Path MTU Table
This chapter introduces the IPv6 Path MTU table.
43.1 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.
43.2 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 241 Management > Path MTU Table
The following table describes the labels in this screen.
Table 161 Management > Path MTU Table
LABEL DESCRIPTION
Path MTU
aging time
This field displays how long an entry remains in the Path MTU table before it ages out and
needs to be relearned.
Index This field displays the index number of each entry in the table.
Destination
Address
This field displays the destination IPv6 address of each path/entry.
MTU This field displays the maximum transmission unit of the links in the path.
Expire 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.
