
C
HAPTER
51
| IP Routing Commands
Policy-based Routing for BGP
– 1907 –
These longer prefixes may be advertised in addition to an aggregate,
even when the aggregate advertisement is sufficient for basic
reachability. This type of inter-domain traffic engineering is a widely
used phenomenon that is contributing to growth in the size of the
global routing table.
Traffic engineering via longer prefixes is only effective when the longer
prefixes have a different next hop from the less specific prefix. Thus,
past the point where the next hops become identical, the longer
prefixes provide no value whatsoever. This command can be used to
limit the radius of propagation of more specific prefixes by adding a
count of the ASes that may be traversed by the more specific prefix.
◆
Private AS numbers [RFC1930] and confederation AS members
[RFC3065] found in the AS_PATH are not counted. AS numbers found
within an AS_SET are not counted and an entire AS_SET is counted as
a single AS. Each instance of an AS number that appears multiple times
in an AS_PATH is counted.
If the AS_PATHLIMIT attribute is attached to a prefix by a private AS,
then when the prefix is advertised outside of the parent AS, the AS
number contained in the AS_PATHLIMIT attribute should be replaced by
the AS number of the parent AS.
Similarly, if the AS_PATHLIMIT attribute is attached to a prefix by a
member of a confederation, then when the prefix is advertised outside
of the confederation boundary, then the AS number of the
confederation member inside of the AS_PATHLIMIT attribute should be
replaced by the confederation's AS number.
E
XAMPLE
Console(config)#route-map RD permit 8
Console(config-route-map)#match pathlimit as 5
Console(config-route-map)#on match goto 20
Console(config-route-map)#
match peer
This command sets the peer address to match in routing messages. Use
the
no
form to remove this entry from a route map.
S
YNTAX
match peer
{
peer-address
|
local
}
no match peer
[
peer-address
|
local
]
peer-address
– IP address of neighboring router sending routing
messages.
local
– Static or redistributed routes.
C
OMMAND
M
ODE
Route Map
Summary of Contents for ECS4660-28F
Page 1: ...Management Guide www edge core com ECS4660 28F Layer 3 Gigabit Ethernet Switch...
Page 2: ......
Page 4: ......
Page 12: ...ABOUT THIS GUIDE 12...
Page 64: ...CONTENTS 64...
Page 90: ...TABLES 90...
Page 92: ...SECTION I Getting Started 92...
Page 122: ...SECTION II Web Configuration 122 Multicast Routing on page 825...
Page 148: ...CHAPTER 3 Using the Web Interface Navigating the Web Browser Interface 148...
Page 224: ...CHAPTER 5 Interface Configuration VLAN Trunking 224 Figure 68 Configuring VLAN Trunking...
Page 262: ...CHAPTER 6 VLAN Configuration Configuring VLAN Translation 262...
Page 304: ...CHAPTER 9 Congestion Control Automatic Traffic Control 304...
Page 340: ...CHAPTER 11 Quality of Service Attaching a Policy Map to a Port 340...
Page 452: ...CHAPTER 13 Security Measures DHCP Snooping 452...
Page 740: ...CHAPTER 17 IP Services Configuring the PPPoE Intermediate Agent 740...
Page 866: ...CHAPTER 21 Multicast Routing Configuring PIMv6 for IPv6 866...
Page 882: ...CHAPTER 22 Using the Command Line Interface CLI Command Groups 882...
Page 1024: ...CHAPTER 26 Remote Monitoring Commands 1024...
Page 1030: ...CHAPTER 27 Flow Sampling Commands 1030...
Page 1088: ...CHAPTER 28 Authentication Commands PPPoE Intermediate Agent 1088...
Page 1162: ...CHAPTER 29 General Security Measures Configuring Port based Traffic Segmentation 1162...
Page 1186: ...CHAPTER 30 Access Control Lists ACL Information 1186...
Page 1214: ...CHAPTER 31 Interface Commands Transceiver Threshold Configuration 1214...
Page 1238: ...CHAPTER 33 Port Mirroring Commands RSPAN Mirroring Commands 1238...
Page 1258: ...CHAPTER 34 Congestion Control Commands Automatic Traffic Control Commands 1258...
Page 1270: ...CHAPTER 36 UniDirectional Link Detection Commands 1270...
Page 1276: ...CHAPTER 37 Address Table Commands 1276...
Page 1336: ...CHAPTER 39 ERPS Commands 1336...
Page 1386: ...CHAPTER 40 VLAN Commands Configuring Voice VLANs 1386...
Page 1406: ...CHAPTER 41 Class of Service Commands Priority Commands Layer 3 and 4 1406...
Page 1424: ...CHAPTER 42 Quality of Service Commands 1424...
Page 1536: ...CHAPTER 43 Multicast Filtering Commands MLD Proxy Routing 1536...
Page 1602: ...CHAPTER 45 CFM Commands Delay Measure Operations 1602...
Page 1624: ...CHAPTER 47 Domain Name Service Commands 1624...
Page 1646: ...CHAPTER 48 DHCP Commands DHCP Server 1646...
Page 1974: ...SECTION IV Appendices 1974...
Page 1980: ...APPENDIX A Software Specifications Management Information Bases 1980...