2/9/2024 0 Comments Ip route summary calculator![]() Network Next Hop Metric LocPrf Weight Path Origin codes: i - IGP, e - EGP, ? - incomplete Status codes: s suppressed, d damped, h history, * valid, > best, i - internal ![]() The more specific 10.160.10.0/16 and 10.160.20.0/16 routes are suppressed, as this BGP table on Router C shows: RouterC# show ip bgpīGP table version is 6, local router ID is 10.4.4.1 The aggregate 10.160.0.0/8 is the classless inter-domain routing (CIDR) route. Router C only announces the aggregate 10.160.0.0/8 to Router D. This action occurs because you have configured the summary-only argument on Router C. !- The network is summarized, and Router C only These sample configurations enable you to examine this feature and how this argument helps BGP detect and avoid loops. This as-set argument summarizes the AS_PATH attributes of all the individual routes. Use of the as-set argument creates an aggregate address with a mathematical set of autonomous systems (AS). Network Diagram Aggregate without the as-set Argument This document illustrates how to manipulate the different attributes when you use the aggregate-address command and how to influence the propagation. When you issue the aggregate-address command without any arguments, there is no inheritance of the individual route attributes (such as AS_PATH or community), which causes a loss of granularity. Background Informationīorder Gateway Protocol (BGP) allows the aggregation of specific routes into one route with use of theĪggregate-address address mask command. Refer to Cisco Technical Tips Conventions for more information on document conventions. If your network is live, ensure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. However, the configuration in this document was tested with Cisco IOS ® Software Release 12.2(28). This document is not restricted to specific software and hardware versions. For more information, see BGP Case Studies. Prerequisites RequirementsĬisco recommends that you have knowledge of this topic:īasic BGP operation. It might seem long winded but once you get the hang of it you can do these things in your head very quickly.This document describes how to manipulate the different attributes when you use the aggregate-address command and how to influence the propagation. So you have a summary address of 172.16.0.0/13 From the above 248 is the 5th bit position so =Ĩ (because the first byte is all 1's ie 255) + 5 (because the next byte is 248) = 13 To summarise 8 networks you use a 248 ie.ġ28 summarised networks = 128 = 1st bit position in byteĦ4 summarised networks = 192 = 2nd bit position in byte So you want to go from 16 -> 22 which is 22 - 16 = 6. If you want to summarise 3 networks then you need to use 4, if you want to summarise 6 networks then you need to use 8. You can summarise 2, 4, 8, 16, 32, 64 & 128 networks exactly due to the bits in byte. Sarei felice se qualcuno mi desse dei chiarimenti a riguardoįirstly if you summarise these networks to 172.16.0.0/13 then you are including networks. ![]() ![]() Ma in realtà non è questo il calcolo esatto giusto? Invece di convertire ogni volta in binario, c è un metodo sbrigativo ?Ĭredevo che si facesse in questa maniera: ![]() I bit in comune sono 5 + 8 (172) è uguale 13. Mi basterebbe convertire le cifre 16 - 18 - 20 - 22 in binario e trovare gli elementi in comune, ricavando la subnet mask. Sono a conoscenza del funzionamento della summary route,ma non riesco a calcolarla senza essere costretto a trasformare gli ottetti in binario. Scrivo per avere se è possibile dei chiarimenti circa la summary route. I would be happy if someone give me clarification about Instead of converting each time in binary, c is an expeditious method?īut in reality this is not the exact calculation right? I would suffice to convert the figures 16 to 18 - 20 - 22 in track and find the common elements, obtaining the subnet mask. What single network address and mask can be used to summarize the networks shown? I understand the operation of the summary route, but I can not calculate it without having to convert the octets in binary. I am writing to you if you can clarifications about the summary route. ![]()
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