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Figure 1. BGP configuration
Procedure
This section describes the steps of how to configure basic BGP functions on SwitchA, SwitchB, SwitchC and SwitchD.
Switch A
Step1 Configure the VLANs and VLAN interfaces.
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admin@SwitchD# commit |
Viewing BGP Peer Status on Switch B
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admin@SwitchB# run show bgp neighbor
BGP neighbor on vlan20: 192.168.20.1, remote AS 100, local AS 200, external link
BGP version 4, remote router ID 1.1.1.1, local router ID 2.2.2.2
BGP state = Idle
Last read 00:15:06, Last write never
Hold time is 180, keepalive interval is 60 seconds
Graceful restart information:
Local GR Mode: Helper*
Remote GR Mode: NotApplicable
R bit: False
Timers:
Configured Restart Time(sec): 120
Received Restart Time(sec): 0
Message statistics:
Inq depth is 0
Outq depth is 0
Sent Rcvd
Opens: 0 0
Notifications: 0 0
Updates: 0 0
Keepalives: 0 0
Route Refresh: 0 0
Capability: 0 0
Total: 0 0
Minimum time between advertisement runs is 0 seconds
For address family: IPv4 Unicast
Not part of any update group
Community attribute sent to this neighbor(all)
0 accepted prefixes
Connections established 0; dropped 0
Last reset 00:15:06, Waiting for Peer IPv6 LLA
BGP Connect Retry Timer in Seconds: 120
Read thread: off Write thread: off FD used: -1
BGP neighbor is 192.168.30.2, remote AS 200, local AS 200, internal link
Administratively shut down
BGP version 4, remote router ID 3.3.3.3, local router ID 2.2.2.2
BGP state = Idle
Last read 00:15:06, Last write never
Hold time is 180, keepalive interval is 60 seconds
Graceful restart information:
Local GR Mode: Helper*
Remote GR Mode: NotApplicable
R bit: False
Timers:
Configured Restart Time(sec): 120
Received Restart Time(sec): 0
Message statistics:
Inq depth is 0
Outq depth is 0
Sent Rcvd
Opens: 0 0
Notifications: 0 0
Updates: 0 0
Keepalives: 0 0
Route Refresh: 0 0
Capability: 0 0
Total: 0 0
Minimum time between advertisement runs is 600 seconds
For address family: IPv4 Unicast
Not part of any update group
Advertise bestpath per AS via addpath
Override ASNs in outbound updates if aspath equals remote-as
Community attribute sent to this neighbor(all)
0 accepted prefixes
Connections established 0; dropped 0
Last reset 00:15:06, No AFI/SAFI activated for peer
External BGP neighbor may be up to 255 hops away.
BGP Connect Retry Timer in Seconds: 111
Peer Authentication Enabled
Read thread: off Write thread: off FD used: -1
BGP neighbor is 192.168.40.2, remote AS 200, local AS 200, internal link
BGP version 4, remote router ID 4.4.4.4, local router ID 2.2.2.2
BGP state = Active
Last read 00:15:06, Last write never
Hold time is 180, keepalive interval is 60 seconds
Graceful restart information:
Local GR Mode: Helper*
Remote GR Mode: NotApplicable
R bit: False
Timers:
Configured Restart Time(sec): 120
Received Restart Time(sec): 0
Message statistics:
Inq depth is 0
Outq depth is 0
Sent Rcvd
Opens: 0 0
Notifications: 0 0
Updates: 0 0
Keepalives: 0 0
Route Refresh: 0 0
Capability: 0 0
Total: 0 0
Minimum time between advertisement runs is 0 seconds
For address family: IPv4 Unicast
Not part of any update g |
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View the BGP routing table of Switch B:
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admin@SwitchD#admin@SwitchB# run show bgp routesshow bgp Statusipv4 Codes: * valid route, > best route Origin Codes: i IGP, e EGP, ? incomplete Prefix Nexthop Peer AS Path ------ ------- ---- ------- *> unicast ===================== BGP table version is 2, local router ID is 4.4.4.4, vrf id 0 Default local pref 100, local AS 200 Status codes: s suppressed, d damped, h history, * valid, > best, = multipath, i internal, r RIB-failure, S Stale, R Removed Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self Origin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path *> 192.168.10.0/24 192.168.20.1 1.1.1.1 100 ? admin@SwitchD# 24 192.168.20.1 0 0 32768 i Displayed 1 routes and 1 total paths show bgp ipv6 unicast ===================== No BGP prefixes displayed, 0 exist |
View the BGP routing table of Switch C:
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