Re: [c-nsp] Cisco 6509 reboots on its own... again...

2010-07-05 Thread Tony Li
On Jul 5, 2010, at 4:50 AM, Alan Buxey wrote: == Blades didn't move for months if not years for some ! Plus, diags passed fully without any kind of problem ! we had an issue earlier this year when the temperature of a data centre went up by 3 degrees and cooled repidly. yep. reseating the

Re: [c-nsp] isis routing problem

2010-06-24 Thread Tony Li
Hi Arne, Please send IS-IS configurations, what adjacencies are up, and what your link state databases look like. Thanks, Tony On Jun 24, 2010, at 1:10 PM, Arne Larsen / Region Nordjylland wrote: Hi all. Can someone tell me what might be wrong. I have a router connected with 2

Re: [c-nsp] Catalyst 3750 failure - marsupial interference

2008-04-02 Thread Tony Li
| ... It was founded by ex-DEC folks | | http://en.wikipedia.org/wiki/Len_Bosack | |I must admit, I didn't know that. But leaving in 1979 doesn't take him |very far into VMS days. In fact, Len is a dyed-in-the wool 36-bit head. Like most of the early Cisco team, he was a big Tops-20

Re: [c-nsp] Is there anyway to adjust the administrative distance for 'connected'?

2008-02-14 Thread Tony Li
On Feb 14, 2008, at 5:27 PM, Drew Weaver wrote: This may sound like an odd question, but I was just curious if there is any way to adjust the administrative distance for 'connected'? I'm trying to make it impossible for hosts whom are 'blackholed' to even send traffic to their

Re: [c-nsp] Top 10 Network Engineering Tools

2008-01-28 Thread Tony Li
1. A laptop with a built-in serial port or a USB-Serial converter that you know works (in fact, even if your laptop has a built-in serial port it could be useful to have a USB-Serial converter handy in case you need to connect to multiple devices at once). Also need to make sure that your

Re: [c-nsp] BGP routes: 207k + 157k = 238k ???...

2008-01-24 Thread Tony Li
there is something I can't quite figure out with BGP. Let a bi-homed AS with only two BGP speakers (each of them has one eBGP session with a different upstream, they speak iBGP together). Router 1 receives 238k routes from provider A; so does router 2 from provider B. When looking at

Re: [c-nsp] 2811 crash...

2008-01-24 Thread Tony Li
I've got a 2811 that crashed with a bus error within a few hours of enabling Netflow export. I haven't opened a TAC case yet, but my curiousity was aroused by the address at which the error occured 0xDEADBEF3. This could almost be pronounced Dead Beef Yes - traditionally it's

Re: [c-nsp] BGP routes: 207k + 157k = 238k ???...

2008-01-24 Thread Tony Li
On Jan 24, 2008, at 7:22 PM, Deepak Jain wrote: In your opinion, is there any downside to this behavior operationally (other than the time it takes for a unadvertised route to present itself in the event the advertised route is withdrawn?)? Other than that, Mrs. Lincoln, how was the

Re: [c-nsp] tcpdump on ios?

2008-01-11 Thread Tony Li
On Jan 11, 2008, at 5:21 PM, Kim Onnel wrote: IMHO, it is very difficult to design a router that will capture traffic being hardware switched, am i correct? This is correct. What do you do with the data? Without dedicated high bandwidth storage, there's no place for it to go.

Re: [c-nsp] OT: Pingsta spam

2008-01-01 Thread Tony Li
Yes, I've heard of them. They don't seem to add much value. Tony On Jan 1, 2008, at 9:00 PM, Jay Hennigan wrote: Anyone on-list heard of pingsta.com? Within the last hour I've received ten invitations to join them as an internetwork expert. My immediate reaction is to never do

Re: [c-nsp] NTP Config

2007-07-12 Thread Tony Li
On Jul 12, 2007, at 9:18 AM, Stephen Wilcox wrote: You can do this with the configs suggested - if you sync to an external time source your clocks will be accurate and if you dont they will be wrong. Agreed. The time resulting from such a configuration is generally less accurate than

Re: [c-nsp] NTP Config

2007-07-11 Thread Tony Li
I tend to use tick and tock (.usno.navy.mil) for my stratum-2 servers. There are others which allow public access, but why not just go to the horse's mouth? The horse can pretty far away. If you're topologically distant, then access to tick and tock might have substantial amounts of

Re: [c-nsp] Access-list Question

2007-05-16 Thread Tony Li
On May 15, 2007, at 10:00 PM, Brian McMahon wrote: My personal theory (SWAG) is that, long ago in the Elder Days of single-digit IOS version numbers, some clever programmer figured out a way to save a couple of processor cycles per ACL by coding the bitmask this way around -- an efficiency