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Note: All configurations are tested on Cisco C3745 series Router with IOS Version 12.4(15)T14. Now the first 13 bits are common, hence the mask of 125 (112 + 13).įor complete configurations, please see attached files. R2(config-if)# ipv6 summary-address eigrp 10 2012:1:1:1:1:1:1:0/125 5Ī msak of 125 is chosen because, the first seven blocks are common of the loopback 1, 2, 3, and 4 breaking the eigth block as On Router R2, interface fa 0/0, we are configuring route summarization command " ipv6 summary-address eigrp 10 2012:1:1:1:1:1:1:0/125"Įnter configuration commands, one per line. A summary of these IPv6 prefixes is sent to R1. IPv6 addresses of Lo Int 1/2/3/4 are somewhat similar with only change in the 8th block. Further R2, is configured to advertise ipv6 prefixes of Loopbak 1, 2, 3, 4 and 10. In this document, two routers R1 and R2 are forming IPv6 EIGRP relationship through interface Fa 0/0 under AS 10. After configuring the summarization command the router drops IPv6 EIGRP relationships to reestablish them again, this renew input events and make neighbors rebuild their topology tables and perform DUAL algorithm local computation again using the new advertisements from the router who reconfigured summarization. The summarization is performed on interface-basis by command. IPv6 EIGRP route summarization is similar to IPv4. The administrative distance metric is used to advertise a summary address without installing it in the routing table. EIGRP for IPv6 summary routes are given an administrative distance value of 5. Its also helps in bringing down the router CPU when installing multiple routes in the routing table. Command History Usage GuidelinesThe ipv6 summary-address eigrpcommand is used to configure interface-level address summarization. Route Summarization helps to make the routing table smaller and still allow for complete connectivity.