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    , 30-12-2020

    longest prefix match cisco

    Prefix length trumps all other route attributes. To make it more clear lets lab it up. If there is a tie, the AD(administrative distance) is used to determine the choice. 1) Area Types [Intra, Inter, External E1, External E2, NSSA N1, NSSA N2] 2) Longest prefix match A video about longest match routing and how it can steer routes the correct and incorrect path. 2) Lower Administrative Distance [In case of different routing protocol] 3) Lower Metric [In case of same routing protocol] Note: There will be an extra tie-breaker for OSPF alone. Southern California RouterGods Meetup Group www.routergods.com Longest prefix match (also called Maximum prefix length match) refers to an algorithm used by routers in Internet Protocol (IP) networking to select an entry from a forwarding table.. Because each entry in a forwarding table may specify a sub-network, one destination address may match more than one forwarding table entry. Prefix Length - The longest-matching route is preferred first. Longest Prefix Match. Administrative Distance - In the event there are multiple routes to a destination with the same prefix length, the route learned by the protocol with the lowest administrative distance is preferred. In AWS, a Virtual Private Cloud (VPC) peering connection is a networking connection between two VPCs which allows you to route specific traffic between them using either private IPv4 addresses or IPv6 addresses. The less the AD, the more believable/preferable the route is. On CUBE and SIP gateway when one voice dial peer has only one destination pattern, this introduces dial peer configuration in large amounts when multiple destination patterns are used. It compares the Destination IP Address of the packet it receives to each entry it has in its routing table, the longest network bits that has a match wins. (and Bitwise XOR is used to figure out wildcard operations). First, what is Longest-Prefix Match? With the introduction of support for multiple destination patterns on a dial-peer, configuration is largely simplified and reduced. 1) Longest prefix match. The example below has the same topology with our previous example but with an additional router, R5. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. The first step is preferring the longest match/prefix. Longest Prefix Match: Understanding Advanced Concepts in VPC Peering VPC Peering Basics. If there are two routes to the same destination then the largest prefix/mask is used to make a choice. So, the answer in your case would be A and C. it is the way of an IP Router to select which route it will choose to forward the packets to. The longest prefix match can come up particularly when you have summary routes. Correct Answer: C. 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