Chapter 47 Path MTU Table
GS1920v2 Series User’s Guide
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Pa th MTU Ta b le
47.1 Pa th MTU O ve rvie w
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.
47.2 Vie wing the Pa th MTU Ta b le
Use this screen to view IPv6 path MTU information on the Switch. Click
Ma na g e m e nt
>
Pa th MTU Ta b le
in
the navigation panel to display the screen as shown.
Fig ure 283
Management > Path MTU Table
The following table describes the labels in this screen.
Table 192 Management > Path MTU Table
LABEL
DESC RIPTIO N
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.
