BGP short
for Border Gateway Protocol is a translation protocols used to exchange
routing information between different autonomous systems. BGP is true
built-in policy based routing protocol and using TCP port 179 to update
the BGP routing table. BGP basically designed to manage large scale
networks or to configure multi-home environments and when redistribution
is not possible between different protocols (between RIP, OSPF &
EIGRP).
Today tip will help you configure BGP between two
different types of routing protocols. In this case, we will try to
configure three different routers with routing protocols OSPF & RIP and
then complete the all routing tables using BGP.
Follow the network topology of three different class network in
given figure:
Configuration to Enable OSPF & BGP on Router B
In global configuration Mode:
B (config) # router ospf 1
(Enable ospf protocol and 1 is Autonomous number)
B (config-router) # network 40.0.0.0 0.255.255.255 area 0
(Advertised router B Serial Network 40.0.0.0)
B (config-router) # network 210.100.20.0 0.0.0.255 area 0
(Advertised router B Ethernet Network 210.100.20.0)
B (config-router) #redistribute bgp 20 subnet metric 50
(Redistribute bgp into ospf)
Now configure BGP on router B
B(config)# router bgp 20
B (config-router) # neighbor 61.1.1.2 remote-as 10
B (config-router) #end
Now run show command to display the BGP updates.
B #show ip bgp
Now verify the routes in router B routing table, run the command
B #show ip route
Configuration to Enable RIP & BGP on Router C
In global configuration Mode:
C (config) # router rip
(Enable rip protocol)
C (config-router) # network 210.100.30.0
(Advertised router C Serial Network 210.100.30.0)
C(config)#ip route 40.0.0.0 255.0.0.0 61.1.1.1
(Create a static route to router A to complete routing table.)
Now configure BGP on router C
C(config)# router bgp 10
C (config-router) # neighbor 61.1.1.1 remote-as 20
C (config-router) #end
Now run show command to display the BGP updates.
C #show ip bgp
Now verify the routes in router C routing table, run the command
C #show ip route
Configuration to Enable OSPF & BGP on Router A
In global configuration Mode:
A (config) # router ospf 1
(Enable ospf protocol and 1 is Autonomous number)
A(config-router) # network 40.0.0.0 0.255.255.255 area 0
(Advertised router A Serial Network 40.0.0.0)
A(config-router) # network 210.100.10.0 0.0.0.255 area 0
(Advertised router A Ethernet Network 210.100.10.0)
COMPUTER TIPS