Merit Network
Can't find what you're looking for? Search the Mail Archives.
  About Merit   Services   Network   Resources & Support   Network Research   News   Events   Home

Discussion Communities: Merit Network Email List Archives

North American Network Operators Group

Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical

Re: Regarding global BGP community values

  • From: Alex P. Rudnev
  • Date: Wed Oct 13 07:15:50 1999


In the 'SNMPSTATD' monitoring I use (it's in the near plans) to monitor
critical argument. If it is less than 128K, 'config' command do not work;
if it is less than 1500 bytes, nothing works at all -:)

> AFAIK, there is some more memory wasting and dangerous feature in
> current (at least it was so year ago) implementation of memory allocation
> subsystem in Cisco: when you are going below some magic value
> (for defaultless routers usualy below 10-8 megs) and have even
> moderate BGP activity, very soon (less then a day) you will be out of
> memory even in the presence of this 8-10 megs of free memory because your largest fragment will be very close to 0.
> As I was told several years ago this is fundamental "feature" of
> memory allocation implementation (poor fragmentation resistance with low memory and lots of small alloc's/free's).
The fundamental feature for the REAL-TIME device (such as ROUTER) should be
a lot of HOT-DOG mechanisms preventing /at least/ lost of the control over
the device. In case of such _voracious_ processes (as BGP is) it should
be used any mechanism preventing it from catching all existing
(CPU and MEMORY in our case). 

Discussion Communities

About Merit | Services | Network | Resources & Support | Network Research
News | Events | Contact | Site Map | Merit Network Home

Merit Network, Inc.