Multicast and Routing Guide K/KA/KB.15.15

Matching tags.................................................................................................................211
Using set commands.............................................................................................................211
Setting the next hop.........................................................................................................211
Setting the route metric.....................................................................................................211
Setting the metric type......................................................................................................211
Setting the tag value........................................................................................................212
Route policy overview............................................................................................................212
Configuring route policy...................................................................................................212
Route maps..........................................................................................................................212
Match commands.................................................................................................................214
Using route policy in route redistribution..................................................................................214
Baseline: Intra-domain routing using default settings.............................................................214
Basic inter-domain protocol redistribution............................................................................217
Finer control of inter-domain routing using route policy..........................................................218
Redistribution using tags...................................................................................................222
9 ICMP Router Discovery Protocol................................................................225
Configuring IRDP..................................................................................................................225
Enabling IRDP globally.....................................................................................................225
Enabling IRDP on an individual VLAN interface...................................................................226
Viewing IRDP information......................................................................................................227
10 Dynamic Host Configuration Protocol.......................................................228
Enabling DHCP relay............................................................................................................228
Using DCHP Option 12 to send a hostname.............................................................................228
Configuring a BOOTP/DHCP relay gateway............................................................................229
Viewing the BOOTP gateway............................................................................................229
Operating notes..........................................................................................................230
Configuring an IP helper address............................................................................................230
Operating notes..............................................................................................................230
Disabling the hop count in DHCP requests...............................................................................230
Operating notes..............................................................................................................231
Verifying the DHCP relay configuration....................................................................................231
Viewing the DHCP relay setting.........................................................................................231
Viewing DHCP helper addresses........................................................................................231
Viewing the hop count setting............................................................................................232
Viewing the MAC address for a routing switch..........................................................................232
Configuring Option 82..........................................................................................................233
Operating notes..............................................................................................................236
Overview of DHCP...............................................................................................................237
DHCP packet forwarding..................................................................................................237
Unicast forwarding......................................................................................................237
Broadcast forwarding..................................................................................................237
Enabling DHCP relay operation.........................................................................................237
Hop count in DHCP requests..................................................................................................237
DHCP Option 82..................................................................................................................238
Option 82 server support..................................................................................................239
General DHCP Option 82 requirements and operation.........................................................239
Requirements..............................................................................................................239
General DHCP-relay operation with Option 82...............................................................239
Option 82 field content.....................................................................................................240
Forwarding policies..........................................................................................................241
Multiple Option 82 relay agents in a client request path.......................................................242
Validation of server response packets.................................................................................243
Multinetted VLANs...........................................................................................................245
10 Contents