Netgear GSM7212P GSM5212P/GSM7212P/GSM7212F/GSM7224P CLI Manual - Page 243

ProSafe Managed Switch OSPF advertises the IP MTU in the Database Description packets it sends to its neighbors during database exchange. If two OSPF neighbors advertise different IP MTUs, they will not form an adjacency. (unless OSPF has been instructed to ignore differences in IP MTU with the ip ospf mtu-ignore command.) Note: The IP MTU size refers to the maximum size of the IP packet (IP Header + IP payload). It does not include any extra bytes that may be required for Layer-2 headers. To receive and process packets, the Ethernet MTU (see mtu on page 40) must take into account the size of the Ethernet header. Default Format Mode 1500 bytes ip mtu Interface Config no ip mtu This command resets the ip mtu to the default value. Format Mode no ip mtu Interface Config encapsulation This command configures the link layer encapsulation type for the packet. The encapsulation type can be ethernet or snap. Default Format Mode ethernet encapsulation {ethernet | snap} Interface Config Note: Routed frames are always ethernet encapsulated when a frame is routed to a VLAN. Routing Commands 243