ZyXEL GS1920 Series User Guide - Page 342
Path MTU, Path MTU Table
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CHAPTER 44 Path MTU Table 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 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. GS1920 Series User's Guide 342