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2-10 Release Note
Software Version 2.7.5
C613-10454-00 REV A
When a BGP process passes an update message through a route map:
1. It checks the entries in order, starting with the lowest numbered entry, until
it finds a match.
2. It then takes the action specified by that entry’s action parameter. If the
action is exclude, it filters out that update or prefix. If the action is include,
it filters in that update or prefix.
3. If the action is include, it modifies attributes as specified by the entry’s set
clauses if there are any.
4. It then stops processing that update message; it does not check the
remaining entries in the route map.
Every route map ends with an implicit entry that matches all routes with an
action of include. This ensures that if no entries in a route map generate a
match, the update message or route is included without modification.
The rest of this section describes:
■ How to create a route map
■ How to configure an entry with a match clause
■ How to configure an entry with a set clause
How to create a route map
You do not have to create a route map as a separate step—adding the first entry
automatically creates it.
How to configure an entry with a match clause
The match clause for a route map entry determines which update messages or
prefixes match the entry. Each entry can only match on one characteristic.
Available characteristics you can use with BGP are:
■ AS path list
■ community list
■ Multi Exit Discriminator (MED)
■ next_hop attribute
■ origin attribute
■ prefix list
■ tag
Matching on AS
path list
An entry that matches on aspath lets you select or discard routes that have
taken a particular route or routes through the network.
To do this, first create an AS path list and add entries to it by using one of the
commands:
add ip aspathlist=1..99 [entry=1..4294967295]
include=aspath-reg-exp
add ip aspathlist=1..99 [entry=1..4294967295]
exclude=aspath-reg-exp
See “Creating AS Path Lists for BGP” on page 2-9 for more information about
creating path lists. Table 2-1 on page 2-9 shows the valid syntax for the regular
expression aspath-reg-exp and gives syntax examples.
- Software Version 2.7.5 1
- Overview of New Features 4
- MSS Clamping 5
- 8 MSS Clamping Release Note 8
- Software Version 2.7.5 9 9
- 10 MSS Clamping Release Note 10
- Syntax SHow PPP PPPoe 11
- Command changes 13
- Command Reference Updates 14
- Software Version 2.7.5 15 15
- Command Changes 18
- Syntax SHow IP 21
- DHCP Option 82 Relay 22
- Software Version 2.7.5 25 25
- Syntax SHow BOOTp RELAy 26
- IGMP Enhancements 28
- Filtering and Throttling 29
- Configuring IGMP 30
- IGMP Throttling 31
- Software Version 2.7.5 33 33
- Software Version 2.7.5 35 35
- OSPF Network Types 41
- [{FULl 45
- BGP Enhancements 46
- Automatic Summarising 48
- Aggregating Routes 50
- Software Version 2.7.5 53 53
- Syntax SHow BGP 55
- Syntax SHow BGP PEer[=ipadd] 56
- Software Version 2.7.5 59 59
- Software Version 2.7.5 61 61
- Firewall Enhancements 63
- UDP Port Timeout 65
- Software Version 2.7.5 67 67
- Software Version 2.7.5 73 73
- WAN Load Balancing 74
- VRRP Preemption Delay 75
- Software Version 2.7.5 77 77
- ..3600] [PRIOrity=1..254] 77
- Operating Principles 80
- Load Distribution Methods 81
- 1-4 Release Note 82
- WAN Load Balancing 1-5 83
- Healthcheck 84
- Assigning Weights 85
- Healthchecks 86
- Operation with Firewall 87
- 1-10 Release Note 88
- Before you 89
- Parameter Description 96
- ● eth (such as eth0, eth1) 100
- ● PPP (such as ppp0, ppp1) 100
- C613-10454-00 REV A 101
- Related Commands enable wanlb 109
- Syntax SHow WANLB 112
- Syntax SHow WANLB HEALthcheck 114
- ■ eth (such as eth0, eth1) 122
- ■ PPP (such as ppp0, ppp1) 122
- Filtering IP Routes 123
- 2-2 Release Note 124
- Introduction 125
- Types of Filters 126
- About AS Path Lists 127
- About Route Maps 127
- When to use 128
- About IP Route Filters 129
- Creating Filters 130
- Creating Route Maps for BGP 131
- How to create a route map 132
- ■ exclude the update message 133
- Example comparing 134
- AS path filter and 134
- Matching on 134
- Creating Route Maps for OSPF 138
- Creating IP Route Filters 141
- Applying Filters 142
- Applying AS path 143
- ■ prefix lists 148
- ■ AS path lists 148
- ■ route maps 148
- 2-28 Release Note 150
- [other-options] 150
- Filtering IP Routes 2-29 151
- The filtering 151
- Limitations of route 153
- Interface Routes 154
- Statically-Configured Routes 155
- Configuration Examples 156
- Using a Route Map 157
- Using an AS Path Filter 158
- Using Communities 160
- Command Reference 162
- Parameters for both 173
- Parameters for 173
- Parameters for set 176
- ■ an entire route map 181
- [PREfix=ipadd] 182
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