nanog mailing list archives
Re: Film at 11:00
From: alex () relcom EU net
Date: Wed, 1 Jan 97 18:56:57 +0300
BTW, really all data incorporated from BGP protocl for 3 - 8 core routings do not need more than 32MB RAM; the fact CISCO need more than 32MB ram for core routing is due to inefficient data structures... Exactly it's because they (I think) have solved some other task (not minimize memory, but CPU and development time). What is really 100K routes? 100K * ( 8 bytes - address + maska 4 - pointer to interface 4 - pointer to ASPATH (ASPATHES are really shared by many different routes; You have not 1000,000 different AS PATHES at all) 8 - accounting 8 - some other, ) - it's about 32 bytes in this example. Of cource, it's not true - really we can expect about 64 bytes/route. 64 bytes * 100K = 6 Mb RAM. I can propose it's nessesary 128bytes - it'll be 12MB RAM. But anyway, if somebody designes specially INTERNET CORE router, he can hold any core routing tables in 16 MB RAM, not more. There is a lot of different ways to minimise memory usage. We are far from the theoretical memory leak; the more serious problem may be efficiensy etc..., but there is CISCO FUTIONS and other ideas to hold CPU usage in acceptable range. I am shure we'll be the witnesses of the such events as it have been last year when CISCO's engeneers have fixed serious BGP problem in 1 or 2 nights. Through this way (to solve hardware problems by software) have it's limits. --- Aleksei Roudnev, Network Operations Center, Relcom, Moscow (+7 095) 194-19-95 (Network Operations Center Hot Line),(+7 095) 239-10-10, N 13729 (pager) (+7 095) 196-72-12 (Support), (+7 095) 194-33-28 (Fax) - - - - - - - - - - - - - - - - -
Current thread:
- Re: Film at 11:00 alex (Jan 01)
- Re: Film at 11:00 Tony Li (Jan 01)
- Re: Film at 11:00 alex (Jan 03)
- Re: Film at 11:00 Avi Freedman (Jan 03)
- Re: Film at 11:00 alex (Jan 03)
- Re: Film at 11:00 Jonathan Heiliger (Jan 03)
- Re: Film at 11:00 Ravi Chandra (Jan 04)
- Re: Film at 11:00 alex (Jan 03)
- Re: Film at 11:00 Tony Li (Jan 03)
- Re: Film at 11:00 Ravi Chandra (Jan 04)
- Re: Film at 11:00 Tony Li (Jan 01)
- <Possible follow-ups>
- Re: Film at 11:00 alex (Jan 01)
- Re: Film at 11:00 Avi Freedman (Jan 01)
- Re: Film at 11:00 Tony Li (Jan 01)
- Re: Film at 11:00 Avi Freedman (Jan 01)
- Re: Film at 11:00 Jenn Roberts (Jan 01)
- Re: Film at 11:00 Vadim Antonov (Jan 01)
- Re: Film at 11:00 Tony Li (Jan 01)
- Re: Film at 11:00 Neil J. McRae (Jan 02)
- Re: Film at 11:00 Vadim Antonov (Jan 02)
- Re: Film at 11:00 Tony Li (Jan 02)
- Re: Film at 11:00 Vadim Antonov (Jan 02)
- Re: Film at 11:00 Mike Vallee (Jan 03)