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Spelling: BGP
Border Gateway Protocol. Interdomain routing protocol that replaces
EGP. BGP exchanges reachability information with other BGP systems. It
is defined by RFC1163 [1].
(Source: CISCO)
BGP Uses TCP Port 179 To communicate between other BGP Routers
It will only exchange info between routers specified in the config
file.
64512 to 65534
Only these asn's can be used on a private network the other are for
public (the Internet)
Here is a basic config (parts taken from node fut)
For quagga BGPD
BGPD.CONF
!-*- bgp -*-
!
!BGPd sample configuratin file
!
hostname bgpd
password XXXX or zebra
!enable password please-set-at-here
!
!bgp mulitple-instance -? only if you need to run BGPD more than once
Unlikely on mw.
!
router bgp 7675 -? your routers ASN Should be with in this range
64512 to 65534 and connot be the same as another routers in this
situation.
bgp router-id 10.10.129.145 -? this is your routers id most likey the
same as in your ospf.conf
redistribute ospf -? this will redistribute routes collected by ospfd
to bgpd
redistribute connected -? This will distribute Directly connected
networks to bgp
network 10.0.0.0/16 -? you can use this for mw or add each subnet
that you are connected to i.e: 1network 0.10.128.0/28 network
10.10.129.144/29 and so on
neighbor 10.10.128.97 remote-as 7676 -? for each router on the a
subnet that is running bgp will have its own ip(duh!) and its own asn
you will need to add a line for each router and there asn here.
!
!access-list all permit any most likely you will not need any access
list unless you need to.
!
!The debug section is optional.
debug bgp events
debug bgp filters
debug bgp fsm
debug bgp keepalives
debug bgp updates
!log file bgpd.log
!
log stdout
SIMPLE EXAMPLE FOR THE 10.10.128.0/28 SUBNET
So in The end your config might look like this if you were on the
subnet 10.10.128.0 (example) This is only if the rest of the networks
used ospf
!-*- bgp -*-
hostname bgpd
password zebra
!enable password please-set-at-here
!
router bgp 64512
bgp router-id 10.10.128.1
redistribute ospf
network 10.0.0.0/16
neighbor 10.10.128.3 remote-as 64513
neighbor 10.10.128.5 remote-as 64515
neighbor 10.10.128.7 remote-as 64517
neighbor 10.10.128.8 remote-as 64518
!
!log file bgpd.log
!
log stdout
BGP ASN ALLOCATION
Node ID is the Mw node ID
Router No. Is the router at the node, as you may have more than 1.
ASN 64512 to 65534 try to leave a 5 No. gap between each node.
Node ID
Router No.
ASN
FUT
1
64515
FUU
1
64520
Links:
------
[1] http://www.faqs.org/rfcs/rfc1163.html
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