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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
!DAN'S COMMENT: be careful using redistribute connected - you don't
want to !distribute your local area network subnet onto the
melbwireless network! !bgp should automaticlly distribute routes
covered by the network statement network 10.10.0.0/16 -? 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 10.10.0.0/16 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
GMR
1
64525
Links:
------
[1] http://www.faqs.org/rfcs/rfc1163.html
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