Dell PowerEdge M420 Dell PowerConnect M8024-k Release Notes - Page 26

Layer 3 IPv6 MTU Description IPv6 Fragmentation Support IP Routing Description Static IP routes do not show with the show ip route command VRRP VRID limit is 20. User Impact The switch is not fragmenting the datagram and forwards even when the IP MTU of the forwarding interface is set to a lower value (than the datagram size). IPv6 frames are not allowed to be fragmented. IPv6 frames forwarded in silicon can be up to the lesser of 9216 octets or the link MTU. These frames are forwarded by the switching silicon with no effect. If a frame exceeds the link MTU for a port, it is discarded silently. If a packet is sent to the CPU or originated on the CPU and it exceeds the IPv6 MTU, then the packet still will not be fragmented. Instead, an ICMP error message is returned to the sender. The maximum IPv6 MTU is 1500 bytes. Administrators are advised to only adjust the link MTU and let the system automatically adjust the IPv6 MTU based on the link MTU. User Impact The switch UI will attempt to discourage the configuration of static ip route entries for which a matching subnet does not exist. Certain configuration sequences may still allow such routes to be configured. Configuring an IP address on a VLAN which matches the next hop IP address of the static route in all significant bits will allow the display of the route using the show command. The switch will only support VRRP environments with 20 or less VRRP routers. 24 System Firmware Version 4.1.0.6