Path MTU Table
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.
Path MTU Table
Use this screen to view IPv6 path MTU information on the Switch. Click MONITOR > Path MTU Table > Path MTU Table in the navigation panel to display the screen as shown.
MONITOR > Path MTU Table > Path MTU Table
The following table describes the labels in this screen.
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 or 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. |