How to configure BGP Attribute Origin on Cisco routers?
BGP Origin Attribute
The origin attribute indicates how BGP learned about a particular route. The origin attribute is used for route selection. The origin attribute can have one of three possible values:
IGP—The route is interior to the originating AS. This value is set when the network router configuration command is used to inject the route into BGP.
EGP—The route is learned via the Exterior Border Gateway Protocol (EBGP).
Incomplete—The origin of the route is unknown or learned in some other way. An origin of incomplete occurs when a route is redistributed into BGP.
RUNNING RIP ON ROUTER-A
A(config)# router rip
A(config-router)# network 200.100.50.0
A(config-router)# network 1.0.0.0
RUNNING EBGP ON ROUTER-A
A(config)# router bgp 10
A(config-router)# no synchronization
A(config-router)# neighbor 1.1.1.2 remote-as 20
A(config-router)# neighbor 4.1.1.1 remote-as 20
A(config-router)# network200.100.50.0
RUNNING EBGP ON ROUTER-B
B(config)# router bgp 20
B(config-router)# no synchronization
B(config-router)# neighbor 1.1.1.1remote-as 10
RUNNING EBGP ON ROUTER-D
D(config)# router bgp 20
D(config-router)# no synchronization
D(config-router)# neighbor 4.1.1.2 remote-as 10
RUNNING OSPF ON ROUTER-B
B(config)# router ospf 1
B(config-router)# network 2.0.0.0 0.255.255.255 area 0
B(config-router)# network 1.0.0.0 0.255.255.255 area 0
RUNNING OSPF ON ROUTER-C
C(config)# router ospf 1
C(config-router)# network 2.0.0.0 0.255.255.255 area 0
C(config-router)# network 3.0.0.0 0.255.255.255 area 0
RUNNING OSPF ON ROUTER-D
D(config)# router ospf 1
D(config-router)# network 3.0.0.0 0.255.255.255 area 0
D(config-router)# network 4.0.0.0 0.255.255.255 area 0
RUNNING IBGP ON ROUTER-B
B(config)# router bgp 20
B(config-router)# no synchronization
B(config-router)# neighbor 4.1.1.1remote-as 20
B(config-router)# neighbor 2.1.1.2remote-as 20
RUNNING IBGP ON ROUTER-C
C(config)# router bgp 20
C(config-router)# no synchronization
C(config-router)# neighbor 2.1.1.1remote-as 20
C(config-router)# neighbor 3.1.1.2remote-as 20
RUNNING IBGP ON ROUTER-D
D(config)# router bgp 20
D(config-router)# no synchronization
D(config-router)# neighbor 3.1.1.1remote-as 20
D(config-router)# neighbor 2.1.1.1remote-as 20
DEFINING 4 STATIC ROUTES ON ROUTER-A
A(config)# ip route 192.1.18.0 255.255.255.0 null 0
A(config)# ip route 192.1.19.0 255.255.255.0 null 0
A(config)# ip route 192.1.20.0 255.255.255.0 null 0
REDISTRIBUTION OF STATIC ROUTES INTO BGP 10 – ROUTER-A
A(config)# router bgp 10
A(config-router)# redistribute static
C# show ip bgp
Related Articles
-
How to configure RIP v2 step by step? RIP short for "Routing Information Protocol" is a routing protocol used to select the suitable route for packets with in network.. Read More...
How to configure static routes on Cisco routers? You can configure two types of routing on the router- static and dynamic to send the traffic to destination. Read More...
How to configure VLAN on a Cisco Switch? VLAN stands for virtual LAN and technically we can say, a VLAN is a broadcast domain created by switch. When managing a switch, the management domain is always VLAN 1, the default VLAN. All ports of switch are assigned to VLAN 1 by default. VLAN increase the performance of a network because it divide a network logically in different parts and limit the broadcasts. Read More...
How to configure VTP Client and Server? VTP (VLAN Trunking Protocol) is the protocol that propagates the information about which VLANs exist from one switch to another switch. If VTP did not provide this information, VLANs would have to be created on all switches individually in the network. Read More..
How to configure Trunking between VLANs with 802.1q? Trunk link is used to carry the different VLANs traffic on a single link. There are two different protocols are used for Ethernet trunking, 802. 1q and ISL. Trunking change the formatting of the packets. Read More...How to configure Trunking between VLANs with ISL? Trunking is a technique to carry different VLAN traffic using point to point link between two devices. ISL (InterSwitch Link) is a cisco proprietary protocol can work with Ethernet token ring and Fddi also. Trunking changes the formatting of the packets. Read More...