Conguring IP load sharing.......................................................................................................................................................................................................72
ECMP load sharing for IPv6..................................................................................................................................................................................................... 75
ICMP Router Discovery Protocol conguration................................................................................................................................................................77
IRDP parameters........................................................................................................................................................................................................................... 77
Reverse Address Resolution Protocol conguration.......................................................................................................................................................78
Conguring UDP broadcast and IP helper parameters.................................................................................................................................................80
BootP and DHCP relay parameter conguration.............................................................................................................................................................82
DHCP server....................................................................................................................................................................................................................................84
Displaying DHCP server information....................................................................................................................................................................................93
Conguring IP parameters - Layer 2 switches...........................................................................................................................................................................95
Conguring the management IP address and specifying the default gateway................................................................................................... 95
Conguring Domain Name System resolver.....................................................................................................................................................................96
Changing the TTL threshold.....................................................................................................................................................................................................98
DHCP Assist conguration........................................................................................................................................................................................................98
IPv4 point-to-point GRE tunnels .................................................................................................................................................................................................102
IPv4 GRE tunnel overview......................................................................................................................................................................................................102
GRE packet structure and header format.........................................................................................................................................................................103
Path MTU Discovery support................................................................................................................................................................................................103
Conguration considerations for PMTUD support .....................................................................................................................................................104
Tunnel loopback ports for GRE tunnels............................................................................................................................................................................104
Support for IPv4 multicast routing over GRE tunnels.................................................................................................................................................105
GRE support with other features .........................................................................................................................................................................................106
Conguration considerations for GRE IP tunnels......................................................................................................................................................... 106
Conguration tasks for GRE tunnels.................................................................................................................................................................................. 108
Example point-to-point GRE tunnel conguration.......................................................................................................................................................115
Displaying GRE tunneling information...............................................................................................................................................................................117
Clearing GRE statistics.............................................................................................................................................................................................................121
Bandwidth for IP interfaces..............................................................................................................................................................................................................121
Limitations and pre-requisites...............................................................................................................................................................................................122
OSPF cost calculation with interface bandwidth........................................................................................................................................................... 122
Setting the bandwidth value for an Ethernet interface.................................................................................................................................................123
Setting the bandwidth value for a VE interface.............................................................................................................................................................. 123
Setting the bandwidth value for a tunnel interface........................................................................................................................................................124
Displaying IP conguration information and statistics..........................................................................................................................................................125
Changing the network mask display to prex format.................................................................................................................................................. 125
Displaying IP information - Layer 3 switches.................................................................................................................................................................125
Displaying IP information - Layer 2 switches.................................................................................................................................................................137
Disabling IP checksum check.........................................................................................................................................................................................................140
Layer 3 Routing Protocols........................................................................................................................................................................................... 143
Adding a static IP route......................................................................................................................................................................................................................143
Conguring a "null" route.........................................................................................................................................................................................................144
Static route next hop resolution............................................................................................................................................................................................ 145
Static route recursive lookup..................................................................................................................................................................................................145
Static route resolve by default route....................................................................................................................................................................................145
Adding a static ARP entry................................................................................................................................................................................................................ 146
Modifying and displaying Layer 3 system parameter limits..............................................................................................................................................146
Layer 3 conguration notes................................................................................................................................................................................................... 146
FastIron second generation modules.................................................................................................................................................................................146
FastIron third generation modules.......................................................................................................................................................................................147
Displaying Layer 3 system parameter limits...................................................................................................................................................................147
FastIron Ethernet Switch Layer 3 Routing
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