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Basic IP forwarding on the device ························································································································· 114
FIB table ········································································································································································ 114
Displaying FIB table entries ········································································································································· 114
Configuring load sharing ······································································································································· 116
Configuration procedure ············································································································································· 116
Enabling local-first load sharing ································································································································· 116
Load sharing configuration example ························································································································· 117
Network requirements ········································································································································· 117
Configuration procedure ···································································································································· 117
Verifying the configuration ································································································································· 118
Configuring fast forwarding ··································································································································· 119
Overview ······································································································································································· 119
Configuration procedure ············································································································································· 119
Displaying and maintaining fast forwarding ············································································································ 119
Configuring IRDP ····················································································································································· 120
Overview ······································································································································································· 120
IRDP operation ····················································································································································· 120
Basic concepts ····················································································································································· 120
Protocols and standards ····································································································································· 121
Configuration procedure ············································································································································· 121
IRDP configuration example ········································································································································ 122
Network requirements ········································································································································· 122
Configuration procedure ···································································································································· 123
Verifying the configuration ································································································································· 124
Optimizing IP performance ···································································································································· 125
Enabling an interface to receive and forward directed broadcasts destined for the directly connected network ······················································································································································································· 125
Configuration procedure ···································································································································· 125
Configuration example ······································································································································· 126
Configuring MTU for an interface ······························································································································ 126
Configuring TCP MSS for an interface ······················································································································ 127
Configuring TCP path MTU discovery ······················································································································· 127
Enabling TCP SYN Cookie ·········································································································································· 128
Configuring the TCP buffer size ·································································································································· 129
Configuring TCP timers ················································································································································ 129
Enabling sending ICMP error messages ···················································································································· 129
Disabling forwarding ICMP fragments ······················································································································ 131
Configuring rate limit for ICMP error messages ······································································································· 131
Specifying the source address for ICMP packets ····································································································· 131
Displaying and maintaining IP performance optimization ······················································································ 132
Configuring UDP helper·········································································································································· 133
Overview ······································································································································································· 133
Configuration restrictions and guidelines ·················································································································· 133
Configuring UDP helper to convert broadcast to unicast························································································· 133
Configuring UDP helper to convert broadcast to multicast ······················································································ 134
Displaying and maintaining UDP helper ··················································································································· 135
UDP helper configuration examples ··························································································································· 135
Configuring UDP helper to convert broadcast to unicast ················································································ 135
Configuring UDP helper to convert broadcast to multicast ············································································· 136
Configuring basic IPv6 settings ······························································································································ 138
Overview ······································································································································································· 138
