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What is the reason in protocol eigrp after selecting the networks we write (no auto summary ?

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تم إضافة السؤال من قبل abdalrahman mohmmad , IT Engineer , mixfm
تاريخ النشر: 2013/10/18
Mohamed Elsayed Bayoumi
من قبل Mohamed Elsayed Bayoumi , Senior systems engineer , Egyptian drilling company

because this command turn the protocol from classful into classless routing protocol.

 

when you enter this command, it send the subnet mask for all networks so you can use it in VLSM networks.

tarik RAAZA
من قبل tarik RAAZA

The no auto-summary command prevents automatic route summarization on classful boundaries, which would otherwise result in routing loops in discontiguous networks.

Fahad M Al Thobaiti
من قبل Fahad M Al Thobaiti , Free Lancer consultant , Free Lancer

To get the subnet mask.

Ahmed Mohamad Mohamad Elsherbeny
من قبل Ahmed Mohamad Mohamad Elsherbeny , Head of team , Egypt Penetration Testers

Here is a page of the EIGRP Commands, it is very detailed and well explained and contains what you need to exactly know.

http://www.cisco.com/en/US/docs/ios/12_2/iproute/command/reference/1rfeigrp.html#wp1017389

Hope this was useful and helpful for you.

Amr Saleh
من قبل Amr Saleh , Senior I&C technical office engineer , ENPPI

protect wrong summaries in discontiguos networks !!

Saqib Mehmood
من قبل Saqib Mehmood , Technical Team Lead/Safety Supervisor , Xchange Technology Group

EIGRP automatically summarizes on the major network boundaries by default. . “No auto summary” disables this feature.

Moustafa Tarek Fawzy Ashour
من قبل Moustafa Tarek Fawzy Ashour , communication system Engineer , ABF

If you are using a routing protocol that auto-summarizes (such as RIP or EIGRP) it will send the subnet mask of the classful boundary, and not the actual subnet mask. The command no auto or no auto summary will turn this feature off in RIP and EIGRP, and send the actual subnet mask. If you are using OSPF, you don't have to worry about it because OSPF does not auto-summarize

Rifthy Jameel
من قبل Rifthy Jameel , SR Network and Security Engineer , Tata Consultancy Services

if you have172.16.200.0/24 and172.16.32.0/24 on different network, auto summary will advertise it as172.16.0.0/16 so there will be communication error for the hosts who are sitting between those two subnets. 

 

 

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