Dell PowerConnect 6224P Release Notes - Page 32

ICMP Description IPv4 Fragmentation support 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). ICMP Error message generation ICMPv6 Packet Too Big This is a hardware limitation and is working as designed. The HW does not allow the IP MTU to be configured per VLAN. We can configure the maximum frame size in HW using the 'mtu' command in interface Ethernet mode. However, if a packet exceeds the maximum frame size for a port, it is discarded. If a packet happens to be sent to the software and it exceeds the IP MTU, then the packet still will not be fragmented. An ICMP error message is sent to the sender. The ICMP Error Message generated by the switch has the fields (TTL) unmodified instead of sending with a modified value resulted as a part of forwarding process. The system is not generating Packet Too Big message to the source when it forwards the packet through an interface vlan with mtu smaller than the packet being forwarded. Multicast Description Multicast VLC streams are not received on VLC client on complex network topology. The PowerConnect 6200 Series switches do not have the capability to enforce IP MTU on VLAN Routing interfaces.. User Impact This is not a mainstream problem. DVMRP functionality works fine and such issues are not seen in 2 or 3 router topologies. This issue is seen only in complex topologies under high loads in the presence of other multicast entries upon table full conditions. 30 System Firmware Version 3.2.0.6