Handbook

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QoS levels .............................................................................................................................................................. 83
Using 802.1p priorities to provide QoS ................................................................................................................... 83
802.1p configuration (AOS CLI example)........................................................................................................ 84
802.1p configuration (BBI example) ................................................................................................................. 85
Queuing and scheduling ......................................................................................................................................... 88
Basic IP routing
IP routing benefits ...................................................................................................................................................... 89
Routing between IP subnets .................................................................................................................................... 89
Example of subnet routing ....................................................................................................................................... 91
Using VLANs to segregate broadcast domains ............................................................................................. 92
Routing Information Protocol
Distance vector protocol ......................................................................................................................................... 94
Stability......................................................................................................................................................................... 94
Routing updates ........................................................................................................................................................ 94
RIPv1 ............................................................................................................................................................................. 94
RIPv2 ............................................................................................................................................................................. 94
RIPv2 in RIPv1 compatibility mode ......................................................................................................................... 95
RIP Features ................................................................................................................................................................ 95
Poison ..................................................................................................................................................................... 95
Triggered updates ............................................................................................................................................... 95
Multicast ................................................................................................................................................................ 95
Default ................................................................................................................................................................... 95
Metric ..................................................................................................................................................................... 95
Authentication ..................................................................................................................................................... 95
RIP configuration example ...................................................................................................................................... 96
IGMP Snooping
Introduction ................................................................................................................................................................ 97
Overview ..................................................................................................................................................................... 97
IGMPv3 ................................................................................................................................................................... 97
Fast Leave ............................................................................................................................................................. 98
IGMP Filtering ........................................................................................................................................................ 98
Static multicast router ......................................................................................................................................... 98
IGMP Snooping configuration example .......................................................................................................... 99
OSPF
OSPF overview ..........................................................................................................................................................109
Types of OSPF areas ..........................................................................................................................................109
Types of OSPF routing devices.........................................................................................................................110
Neighbors and adjacencies ............................................................................................................................111
Link-State Database ..........................................................................................................................................111
Shortest Path First Tree .......................................................................................................................................111
Internal versus external routing .......................................................................................................................111
OSPF implementation .............................................................................................................................................112
Configurable parameters ................................................................................................................................112
Defining areas ....................................................................................................................................................112
Interface cost .....................................................................................................................................................114
Electing the designated router (DR) and backup (BCR) ...........................................................................114
Summarizing routes ............................................................................................................................................114
Default routes ...........................................................................................................................................................114
Virtual links ...........................................................................................................................................................115
Router ID ..............................................................................................................................................................116
Authentication ...................................................................................................................................................116
Host routes for load balancing ........................................................................................................................117
OSPF features not supported ...........................................................................................................................118
OSPF configuration examples ...............................................................................................................................118
Example 1: Simple OSPF domain (AOS CLI example) .................................................................................118
Example 2: Virtual links ......................................................................................................................................127
Example 3: Summarizing routes .......................................................................................................................130
Verifying OSPF configuration ...........................................................................................................................131