500
C
HAPTER
27: BGP C
ONFIGURATION
C
OMMANDS
If there are several routes available to one destination address, the route with
smaller MED parameter can be selected as the final route item.
Do not use this command unless it is determined that the same IGP and routing
selection mode are adopted by different autonomous systems.
Example
[3Com-bgp] compare-different-as-med
confederation id
Syntax
confederation id
as-number
undo confederation id
View
BGP view
Parameter
as-number:
The ID of BGP AS confederation. It is equal to the AS number which
contains the AS numbers of multiple sub-ASs. The range is 1 to 65535.
Description
Use the
confederation id
command to configure confederation identifier.
Use the
undo confederation id
command to cancel the BGP confederation
specified by
as-number
argument.
By default, the confederation ID is not configured.
Confederation can be adopted to solve the problem of too many IBGP full
connections in a large AS domain. The solution is, first dividing the AS domain into
several smaller sub-ASs, and each sub-ASs remains full-connected. These sub-ASs
form a confederation. Key BGP attributes of the route, such as next hop, MED,
local preference, are not discarded across each sub-ASs. The sub-ASs still look like
a whole from the point of view of a confederation although these sub-ASs have
EBGP relations. This can assure the integrality of the former AS domain, and ease
the problem of too many connections in the domain
Related command:
confederation nonstandard
,
confederation peer-as
.
Example
# Confederation 9 consists of four sub-ASs, namely, 38, 39, 40 and 41. Here, the
peer 10.1.1.1 is an internal member of the AS confederation while the peer
200.1.1.1 is an external member of the AS confederation. For external members,
Confederation 9 is a unified AS domain.
[SW8800] bgp 41
[3Com-bgp] confederation id 9
[3Com-bgp] confederation peer-as 38 39 40
[3Com-bgp] group Confed38 external
[3Com-bgp] peer Confed38 as-number 38
[3Com-bgp] peer 10.1.1.1 group Confed38
[3Com-bgp] group Remote98 external
Summary of Contents for Switch 8807
Page 30: ......
Page 68: ...66 CHAPTER 2 COMMANDS USED TO LOG IN TO SWITCH ...
Page 78: ...76 CHAPTER 3 CONFIGURATION FILE MANAGEMENT COMMANDS ...
Page 96: ...94 CHAPTER 5 SUPER VLAN CONFIGURATION COMMANDS ...
Page 122: ...120 CHAPTER 8 IP PERFORMANCE CONFIGURATION COMMANDS ...
Page 130: ...128 CHAPTER 9 GARP GVRP CONFIGURATION COMMANDS ...
Page 162: ...160 CHAPTER 11 ETHERNET LINK AGGREGATION CONFIGURATION COMMANDS ...
Page 212: ...210 CHAPTER 13 MSTP CONFIGURATION COMMANDS ...
Page 234: ...232 CHAPTER 16 ACL COMMANDS ...
Page 282: ...280 CHAPTER 18 ACL CONTROL COMMANDS TO CONTROL LOGIN USERS ...
Page 293: ......
Page 294: ...292 CHAPTER 19 VLAN ACL CONFIGURATION COMMANDS ...
Page 310: ...308 CHAPTER 20 802 1X CONFIGURATION COMMANDS ...
Page 370: ...368 CHAPTER 21 AAA AND RADIUS HWTACACS PROTOCOL CONFIGURATION COMMANDS ...
Page 398: ...396 CHAPTER 23 STATIC ROUTE CONFIGURATION COMMANDS ...
Page 462: ...460 CHAPTER 25 OSPF CONFIGURATION COMMANDS ...
Page 498: ...496 CHAPTER 26 INTEGRATED IS IS CONFIGURATION COMMANDS ...
Page 548: ...546 CHAPTER 27 BGP CONFIGURATION COMMANDS ...
Page 570: ...568 CHAPTER 30 RECURSIVE ROUTING CONFIGURATION ...
Page 584: ...582 CHAPTER 32 MULTICAST VLAN CONFIGURATION COMMANDS ...
Page 600: ...598 CHAPTER 33 MULTICAST COMMON CONFIGURATION COMMANDS ...
Page 604: ...602 CHAPTER 34 STATIC MULTICAST MAC ADDRESS CONFIGURATION COMMAND ...
Page 656: ...654 CHAPTER 37 MSDP CONFIGURATION COMMANDS ...
Page 682: ...680 CHAPTER 38 MBGP MULTICAST EXTENSION CONFIGURATION COMMANDS ...
Page 762: ...760 CHAPTER 40 BGP MPLS VPN CONFIGURATION COMMANDS ...
Page 808: ...806 CHAPTER 44 HA CONFIGURATION COMMANDS_HA_CONFIGURATION ...
Page 820: ...818 CHAPTER 45 ARP CONFIGURATION COMMANDS ...
Page 824: ...822 CHAPTER 46 ARP TABLE SIZE CONFIGURATION COMMANDS max arp entry config of slot 13 8192 ...
Page 862: ...860 CHAPTER 47 DHCP CONFIGURATION COMMANDS ...
Page 870: ...868 CHAPTER 48 DNS CONFIGURATION COMMANDS ...
Page 972: ...970 CHAPTER 56 SSH TERMINAL SERVICE CONFIGURATION COMMANDS ...
Page 982: ...980 CHAPTER 57 FILE SYSTEM MANAGEMENT COMMANDS ...
Page 1026: ...1024 CHAPTER 60 INFORMATION CENTER ...
Page 1046: ...1044 CHAPTER 63 PORT PACKET STATISTICS COMMANDS ...
Page 1051: ...Ethernet Port Detection Configuration Commands 1049 ...
Page 1052: ...1050 CHAPTER 64 PORT LOOPBACK DETECTION COMMANDS ...
Page 1053: ...Ethernet Port Detection Configuration Commands 1051 ...
Page 1054: ...1052 CHAPTER 64 PORT LOOPBACK DETECTION COMMANDS ...
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Page 1056: ...1054 CHAPTER 64 PORT LOOPBACK DETECTION COMMANDS ...
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Page 1058: ...1056 CHAPTER 64 PORT LOOPBACK DETECTION COMMANDS ...
Page 1059: ...Ethernet Port Detection Configuration Commands 1057 ...
Page 1060: ...1058 CHAPTER 64 PORT LOOPBACK DETECTION COMMANDS ...
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Page 1062: ...1060 CHAPTER 64 PORT LOOPBACK DETECTION COMMANDS ...
Page 1063: ...Ethernet Port Detection Configuration Commands 1061 ...
Page 1064: ...1062 CHAPTER 64 PORT LOOPBACK DETECTION COMMANDS ...
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Page 1066: ...1064 CHAPTER 64 PORT LOOPBACK DETECTION COMMANDS ...
Page 1090: ...1088 CHAPTER 66 NQA CONFIGURATION COMMANDS ...