nanog mailing list archives
Re: Network Topology
From: Jeff Weisberg <jaw () Op Net>
Date: Wed, 24 Mar 1999 14:41:59 -0500 (EST)
| I need the expert advice from all of you in this issue since my experience | is insignificant compared to some of the members of this list. In your | experience what is better in terms of connectivity to the Internet. My boss | wants me to order 4 T1's (maybe 6) to different providers to be | 'completely' sure that our NOC will 'always' be up & running. I've already | got 2 T's right now, I really don't know how' 'wise' it is to add another | 4 or 6 from 'different' providers. Would it be better for us to get them | from the same 2 upstreams we've already got? Would it be better to get a | Fractional T3? it depends. "better" is a very vague problem constraint. better how? as far as the normal everyday happiness factor better, you will be happier with a FT3 than you will be trying to load balance traffic over 6 T1s (unless you are paid by the hour :-)) on the day that the backhoe convention comes to town, you will be happier having N of M functional T1s than experiencing the deafening wail of your users' "Is the T3 down?" as far as your NOC "always" being up, there are important questions you need to ask: is "always" 3 9s? 4 9s? 5 9s? if we are down, how much money do we lose? what are the various modes of failure? how likely are they to happen? how much does it cost to protect against? (there is probably a greater chance of a drunk driver smashing into the utilty pole outside your NOC, than for 3 ISPs to have a router failure at the same time. and an even greater chance that your CLEC's "redundant" sonet ring, isn't.) --jeff
Current thread:
- Network Topology Victor Alba (Mar 24)
- Re: Network Topology Jared Mauch (Mar 24)
- Re: Network Topology Ravi Pina (Mar 24)
- Re: Network Topology Jody Craft (Mar 24)
- Re: Network Topology Hui-Hui Hu (Mar 24)
- Re: Network Topology Jon Zeeff (Mar 24)
- Re: Network Topology Forrest W. Christian (Mar 24)
- Re: Network Topology Ravi Pina (Mar 24)
- Re: Network Topology bmanning (Mar 24)
- <Possible follow-ups>
- Re: Network Topology Jeff Weisberg (Mar 24)
- Re: Network Topology Jared Mauch (Mar 24)