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by javentre

Mon Jun 09, 2014 10:30 am
 
Forum: Cisco Routing and Switching
Topic: /31 mask
Replies: 18
Views: 2438

Re: /31 mask

I'd agree there's no performance gain from a /30 to a /31, but when folks are more wasteful (or just like numbers aligning) and use a /24 you can have performance issues. When someone ping sweeps that /24 on a PtP link, you create a flood of ARP request packets - most of which go unanswered. This ca...
by javentre

Wed Jun 04, 2014 11:17 am
 
Forum: Cisco Routing and Switching
Topic: Cisco 2821 performance
Replies: 16
Views: 2859

Re: Cisco 2821 performance

Egress NetFlow accounting might adversely affect network performance because of the additional accounting-related computation that occurs in the traffic-forwarding path of the router. http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/netflow/configuration/12-4t/nf-12-4t-book/cfg-nflow-data-expt.html...
by javentre

Wed Jun 04, 2014 10:53 am
 
Forum: Cisco Routing and Switching
Topic: Cisco 2821 performance
Replies: 16
Views: 2859

Re: Cisco 2821 performance

Turn off netflow and retest, if that helps, retest with just ingress netflow.

egress netflow collection is has a larger performance impact than many realize.
by javentre

Wed Jun 04, 2014 9:38 am
 
Forum: Cisco Routing and Switching
Topic: Cisco 2821 performance
Replies: 16
Views: 2859

Re: Cisco 2821 performance

Please post your 2821 config.
by javentre

Wed Jun 04, 2014 4:14 am
 
Forum: Cisco Routing and Switching
Topic: Cisco 2821 performance
Replies: 16
Views: 2859

Re: Cisco 2821 performance

Ok. Is that 25 mbps one way, or 25 in both directions - for a total on 50?

-Sent from Tapatalk
by javentre

Tue Jun 03, 2014 7:27 pm
 
Forum: Cisco Routing and Switching
Topic: Cisco 2821 performance
Replies: 16
Views: 2859

Re: Cisco 2821 performance

What's your testing packet size when pushing 25 mbps? It can make a big difference.
by javentre

Tue Jun 03, 2014 6:58 am
 
Forum: Cisco General
Topic: How often are adjacency table and FIB synced?
Replies: 1
Views: 1216

Re: How often are adjacency table and FIB synced?

Yes, tables do get out of sync between the RIB, FIB and TCAM. It's not a common event, but it can and does happen. This might be a helpful resource for you: http://books.google.com/books?id=eQkaaQf7BOUC&pg=PA97&dq=cef+consistency+checker&hl=en&sa=X&ei=zLeNU9SvNY7JsQSazYHICA&v...
by javentre

Mon Jun 02, 2014 9:38 am
 
Forum: Cisco Routing and Switching
Topic: mac-address flapping but no (physical)loop?
Replies: 17
Views: 7988

Re: mac-address flapping but no (physical)loop?

is it possible that someone connects their laptop with a cable to the N54 switch and has wireless on leading to the mac-address also appearing on the switches with AP attached to them? Very unlikely since a MAC address is tied to a NIC, not a system. The wired and wireless NICs should have differen...
by javentre

Sat May 31, 2014 11:03 am
 
Forum: Cisco Security
Topic: QoS Pre-classify for AnyConnect VPN traffic (IOS)
Replies: 3
Views: 1991

Re: QoS Pre-classify for AnyConnect VPN traffic (IOS)

Disregard. I'm tracking your now.
by javentre

Fri May 30, 2014 7:58 pm
 
Forum: Cisco Routing and Switching
Topic: Proper wiping of old SUP
Replies: 5
Views: 1315

Re: Proper wiping of old SUP

Older boards had NVRAM that was not flash based, when you pull the battery you lost the startup-config.
by javentre

Fri May 30, 2014 6:10 pm
 
Forum: Cisco Routing and Switching
Topic: Help with a VTP backup server
Replies: 5
Views: 1148

Re: Help with a VTP backup server

I would move to a VTP transparent/off solution.
by javentre

Fri May 30, 2014 1:53 pm
 
Forum: New Member Introductions
Topic: Unrelated Bachelor's Degree
Replies: 4
Views: 1451

Re: Unrelated Bachelor's Degree

A bachelors helps get your foot in the door, especially if you don't have experience. The certs help after you've passed HR. I have a bit of experience in consulting and in large enterprises, if you'd like a more lengthy answer or have other questions, if be happy to help offline. -Sent from Tapatalk
by javentre

Fri May 30, 2014 10:42 am
 
Forum: Home Networking
Topic: PC freezes when connecting wirelessly
Replies: 3
Views: 872

Re: PC freezes when connecting wirelessly

dranonyman wrote:On a side note I tried updating to Windows 8.1 but every time my computer freezes on the "setting up a few more things" section and then reverts back after restarting.


This is probably a clue that something larger (than wireless) is askew.
by javentre

Fri May 30, 2014 8:53 am
 
Forum: Cisco General
Topic: Staging and planning changes
Replies: 5
Views: 1420

Re: Staging and planning changes

If it's not on my whiteboard, it's in Excel.
by javentre

Thu May 29, 2014 11:02 am
 
Forum: Cisco General
Topic: Buggy IOS router software
Replies: 14
Views: 2721

Re: Buggy IOS router software

dieselboy has a good start. Release Notes and Bug Search Tool. After you've passed preliminary scans, move the code to the lab with production configs. If it passes a good run in the lab, we roll it out to the production test lab. It's my production gear that supports R&D servers. Baby steps.
by javentre

Thu May 29, 2014 5:43 am
 
Forum: Cisco Routing and Switching
Topic: Cat2960S 10g Problem
Replies: 2
Views: 1099

Re: Cat2960S 10g Problem

What did a 'show interface' look like on the ports that connected to the firewall?
by javentre

Thu May 29, 2014 5:18 am
 
Forum: Cisco General
Topic: Buggy IOS router software
Replies: 14
Views: 2721

Re: Buggy IOS router software

But we might need to spend more money to get that level of service? Advanced Services is generally not free, it's Cisco's in-house Consulting Services / Managed Services. Regarding Cisco knowing their software, I think I'm a one-off but I'm tired of being told "you're the only case having this...
by javentre

Wed May 28, 2014 4:53 pm
 
Forum: Cisco General
Topic: Buggy IOS router software
Replies: 14
Views: 2721

Re: Buggy IOS router software

javentre, I'd rather have Cisco's butt on the line rather than mine I know my environment better than they can/will and they should know their software and hardware better. To the end users of my network - the buck still stops with me. It may very well be a joint effort, but I'm not just handing ov...
by javentre

Wed May 28, 2014 3:59 pm
 
Forum: Cisco Routing and Switching
Topic: Proper wiping of old SUP
Replies: 5
Views: 1315

Re: Proper wiping of old SUP

NVRAM uses a battery, remove it.

-Sent from Tapatalk
by javentre

Wed May 28, 2014 8:58 am
 
Forum: Cisco General
Topic: Buggy IOS router software
Replies: 14
Views: 2721

Re: Buggy IOS router software

A bug scrub is when you're searching for bugs that will potentially impact you during an upgrade. It's generally not something you've hit, but are concerned.

When I'm on the line for an upgrade or recommending code, I'm not going to pass off the job of doing the scrub.
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