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This document is a proposal to implement new routing protocol solutions to an existing network. It is intended to provide the necessary details for the changes and how it will affect the network and its users. The proposed solutions listed below have been proven to be beneficial in a number of ways and meets industry standards. By implementing this proposal we would increase network stability, create a more scalable network, maximize bandwidth use and generate a more stable flow of network traffic.
Create a multiprotocol operational network using EIGRP, OSPF and RIPv2 protocol
EIGRP (Enhanced Interior Gateway Routing Protocol) is a hybrid routing protocol meaning it has the features of both distance vector and link-state protocols. Since it has a full scope of the topology, EIGRP offers 100% loop free routing. Classless routing is also achieved with EIGRP allowing support for VLSMs (Variable Length Subnet Mask) which creates more usable host.
The main goal of routing protocols is learn routes. OSPF (Open Shortest Path First) protocols accomplishes this by learning about every router and subnet in the entire network (“IBM Knowledge Center,” n.d.). Route changes are transmitted to the whole autonomous system in the shortest time with OSPF’s fast convergence.
RIPv2 (Routing Information Protocol version 2) is an improved version of RIPv1. Unlike EIGRP which is a hybrid protocol, RIPv2 is a distance vector routing protocol with a total hop count of 15. Anything beyond the hop count of 15 is considered an unreachable route.
RouterA(config)#router eigrp 100
RouterB(config)router eigrp 100
RouterA(config-router) # network 192.168.1.0
RouterA(config-router) # network 192.168.1.1
RouterA(config-router) # version 2
A0(config)#router ospf 0
A0(config-router)#network 172.16.12.0 0.0.0.3 area 1
A0(config-router)#network 192.168.1.0 0.0.0.255 area 1
A1(config)#router ospf 1
A1(config-router)#network 172.16.12.0 0.0.0.3 area 1
A1(config-router)#network 192.168.1.0 0.0.0.255 area 1
A2(config)#router ospf 2
A2(config-router)#network 172.16.12.0 0.0.0.3 area 2
A2(config-router)#network 192.168.1.0 0.0.0.255 area 2
Implement a secure update of OSPF and EIGRP protocols
It is possible for for malicious or incorrect information to be introduced into the routing table. In order to stop this from happening OSPF and EIGRP MD5 authentication can be implemented which authenticates routes and updates exchanged between routers.
Enabling OSPF MD5 Authentication:
RouterA(config-if)#ip ospf message-digest-key md5 top_secret
RouterA(config)#router ospf 100
RouterA(config-router)#area 0 authentication message-digest
Enabling EIGRP MD5 Authentication:
RouterA(config)#key chain cmit-451
RouterA(config-if)#ip authentication mode eigrp 1 md5
RouterA(config-if)#ip authentication key-chain eigrp 1 cmit-451
Implement a virtual link in one segment of the network
A virtual link is used in a situation where a routing device on the backbone is not physically connected to the backbone (“OSPF Virtual Link,” n.d.). If this is the case, a virtual link must be established between the backbone and the routing device.
Virtual Link Configuration
RouterA(config)#router ospf 1
RouterA(config-router)#area 2 vir
RouterA(config-router)#area 2 virtual link 192.168.0.3
Implement a redistribution system
Since there are two separate networks running different routing protocols the routes between the two must be redistributed in order for communication to continue. Route redistribution allows routers between the two networks to learn each others routing tables. This is accomplished by advertisement of all routes even static and directly connected. As with any multiprotocol network metrics must be defined for each protocol.
EIGRP to OSPF redistribution configuration:
Router(config)#router ospf 1
Router(config-router)#redistribute eigrp 1
Router(config-router)#redistribute eigrp 1 metric 1
Router(config-router)#redistribute eigrp 1 metric 10
Implement BGP connection to ISPs
Having access to multiple ISPs provides internet redundancy. With the implementation of BGP (Border Gateway Protocol), the network can be multihomed with two different ISPs (admin, 2018). As traffic flows each router stores the routes from their neighbor and later uses it to forward traffic. This means network traffic runs on the existing routers and has the ability to select the best path from multiple ISPs.
RouterA(config)#router bgp 89001
RouterA(config-router)#neighbor 192.168.68.2 remote-as 89001
RouterA(config-router)#neighbor 10.2.2.1 remote-as-89002
RouterB(config)#router bgp 89001
RouterB(config-router)#neighbor 192.168.68.2 remote-as 89001
Implement a solution which avoids your network becoming a transit hub for BGP external routes
Although BGP has its benefits it does not not come without some possible downfalls as well. Implementing BGP there is a possibility that your autonomous system will become transit. If so, traffic will then bypass the autonomous system and possibly consume all the CPUs resources and bandwidth.
With the use of a filter-list with the AS PATH access, all advertised network traffic will be from prefixes from within your own AS.
Filter-list with AS PATH access-list
RouterA(config)#ip as-path access-list permit ^$
RouterA(config-router)neighbor 192.168.68.2 filter-list out
RouterA(config-router)neighbor 192.168.68.4 filter-list out
- admin. (2018, August 29). BGP With a Service Provider – Network Direction. Retrieved March 10, 2019, from https://networkdirection.net/blogpost22-bgp-with-a-service-provider/
- IBM Knowledge Center. (n.d.). Retrieved March 10, 2019, from https://www.ibm.com/support/knowledgecenter/en/ssw_ibm_i_71/rzal6/rzal6ospfareas.htm
- OSPF Virtual Link. (n.d.). Retrieved March 10, 2019, from https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/47866-ospfdb7.html
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