1. CO5023 Advanced EIGRP

2. EIGRP autosummarisation EIGRP is unlike OSPF in that it will summarise routes automatically The commands are R1(config)# router eigrp as-number R1(config-router)# auto-summary However, the routes are summarised at the classful boundary – which means two subnets of 10.0.1.0 /24 and 10.0.2.0 /24 would be summarised as 10.0.0.0 /8 This is rather wasteful And, really, how hard would it be to write software to summarise properly on an automatic basis….

3. EIGRP Manual Summarisation This form of auto-summarisation can cause serious problems including routing loops So in practice it is still better to use manual summarisation as with OSPF This can be achieved using the following interface configuration command: Router(config-if)# ip summary-address eigrp as-number network-address subnet- mask Summary routes should be calculated the same way as for OSPF

4. Default route propogation Just as with OSFP, we can use EIGRP to distribute information about the default route for external networks. This is done with the command redistribute static

5. Miscellaneous EIGRP commands Control bandwidth used for EIGRP control traffic: Router(config-if)# ip bandwidth-percent eigrp as-number percent Control hello and dead time intervals: Router(config-if)# ip hello-interval eigrp as-number seconds Router(config-if)# ip hold-time eigrp as-number seconds Equal cost load balancing: (config-router)#maximum-paths number-of-paths For load balancing on unequal cost routes (cool)... (config-router)#variance [multiple of feasible distance] (config-router)# traffic-share balanced

6. Secure EIGRP updates EIGRP can encrypt updates using MD5 authentication (MD5 isn’t secure, blah). The process is more involved than with OSPF