3Com Router 5000 and Router 6000 Family Release Notes v2.41 • Page 12
• When removing FRF.9 compression settings from a frame relay static address mapping, the
interface needs to be reset (shutdown/undo shutdown) for the configuration to take place.
• When the ATM OAM and PVC states are all down, the ATM interface is still showing
state:UP and Line:UP; Use “display atm pvc-info” to see the true state of the individual PVCs.
• ATM statistics may be wrong if the traffic rate exceeds the Class of Service settings
configured.
• PPP STAC compression is not supported on the POS interface.
• ATM OAM up/down timers for transitioning the PVC State are not accurate.
• ATM T3/E3 Modules require all cables to be connected before link LEDs will be lit.
• Changing MLPPP parameters will not take effect until the Virtual-Template or Mp-group is
reset via bringing down all the physical interfaces and bringing them back up again.
3.6 Network Protocol
• Basic NAT doesn’t work on R6080/R6040.
• PPP, Frame relay, HDLC, and E1 interfaces do not support DHCP Global subaddress mode.
• Certain web sites cannot be accessed when using DSL interfaces. To resolve this, set the
outgoing router (WAN) physical or virtual interface to 1410 as the maximum segment size
for TCP.
• The DHCP Server does not remember the DHCP clients after a reboot. The DHCP lease
expiration, client reboot or client renew request will repopulate the DHCP clients table
transparent to the user.
• A Router running DHCP client cannot obtain the default gateway address automatically. This
parameter must be manually configured.
• ICMP type 3 messages are generated for some but not all instances in RFC 1812 (Section
5.2.7.1).
3.7 Routing Protocol
• Where Static Routes point to Ethernet interfaces, ARP responses are ignored. The next-hop
must be specified for static routes on Ethernet interfaces.
• When BGP changes states, minor packet loss will occur at the instance of the change, for
any packet passing through the router.
• OSPF interface costs are not the same on peer DCE/ DTE Frame Relay Serial interfaces. If a
Frame Relay DTE Serial interface is configured for OSPF, and the DCE has a differing baud
rate, the interface has to be configured with the “virtualbaudrate” command. Configure this
command using the same baud rate as the DCE. After configuring, shut down and restart
the interface.
• Undo RIP from interface view removes RIP globally. To remove RIP from interface view use
the command, “Undo RIP work.”
• BGP route dampening does not work for IBGP routes. BGP dampening is designed to work
only for EBGP routes
• The 3Com router will not exchange RIP Updates with various 3rd Party vendor’s equipment
when MD5 “usual” implementation is configured. The 3Com router will only exchange RIP
Updates with a 3rd Party vendor’s equipment when MD5 “Non-Standard” implementation is
configured. Use “Usual” to exchange RIP Updates between 3Com routers.