September 2004 - NANOG - lists.nanog.org

Re: L2 Broadcast/multicast limits on ethernet ports
by KASHIF SALAMM 20 Sep '04

20 Sep '04

Thanx Arien Yes that's the command we will be doing. The basic purpose is to stop the cpu's to shoot up to 70 + % utilistaion and to crash/reboot as we experienced the same. What numbers you are using for 10/100/1000 ports. rgds. KS Arien Vijn <arien.vijn(a)ams-ix.net> wrote: On Sep 20, 2004, at 6:25 PM, KASHIF SALAMM wrote: > We are looking into deploying the L2 broadcast/multicast limits on the > ethernet ports of foundry switches. Just to be sure, you mean that you want to add the following statements to your configuration? broadcast limit x multicast limit y And there is also : unknown-unicast limit x > If anyone has case study or deployed it or any experience and don't > mind sharing , will be very appreciated. We applied limits on BigIron JetCore hardware. We had IronCore silicon before and applied on that hardware also. All limits work well. The switches start to drop the right types of frames as soon as the packet rates supersedes the respective limits. But you need to be aware that these limits only apply to CPU forwarded frames. Hense it won't work as rate limiter on hardware (CAM) forwarded multicast frames. This also means that these features won't ease the CPUs of switches receiving fast amounts of broadcast/multicast frames. But it can be used to limit broadcast storms propagating through your L2-network. Needless to say that, you must be careful if you use some kind of layer-2 redundancy protocol. As most if not all use multicast frames. Hope this helps, Arien

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Telehouse power outage
by Tim Yocum 20 Sep '04

20 Sep '04

FYI, There seems to have been a momentary power loss at Telehouse @ 25 Broadway. Initial reports indicate that there was some form of UPS failure that has since recovered, impacting some or all of the 5th floor; PDU 400.1 seems to have been one of the impacted devices. Regards, - Tim

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L2 Broadcast/multicast limits on ethernet ports
by KASHIF SALAMM 20 Sep '04

20 Sep '04

We are looking into deploying the L2 broadcast/multicast limits on the ethernet ports of foundry switches. If anyone has case study or deployed it or any experience and don't mind sharing , will be very appreciated. Regards KS

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RE: HSSI-adtran
by Philip Lavine 20 Sep '04

20 Sep '04

More clues. It seems that everytime I ping with the 0000 pattern the controller counter: rx_soft_overrun_err=27473, increments. Philip --- Tim McKee <tim(a)baseworx.net> wrote: > This is most likely a framing or line-encoding > mismatch, such as B3ZS vs > PLCP on the physical DS3 or M13/M23 vs CBIT. > > -----Original Message----- > From: owner-nanog(a)merit.edu > [mailto:owner-nanog@merit.edu] On Behalf Of > Philip Lavine > Sent: Monday, September 20, 2004 1:26 PM > To: nanog > Subject: Re: HSSI-adtran > > > To all, > > I tried the attenuator and they failed to provide > any relief. > > Philip > --- Alex Bligh <alex(a)alex.org.uk> wrote: > > > > > > > > > --On 20 September 2004 07:56 -0700 Philip Lavine > > <source_route(a)yahoo.com> > > wrote: > > > > > I am having a problem witha DS3 that terminates > > into a > > > Adtran CSU (T3SU-300) and then into a 7200 with > > HSSI. > > > I can not ping with a 0000 data pattern and I > experience packet loss > > > and errors when I pass TCP traffic. > > > > > > Adtran recommended an attenuator. > > > > > > What is the issue here? Is the signalling > > incompatible > > > with a PA-T3+. Should I be wasting my time with > an external CSU? > > > > Last time I looked, PA-T3+ were even MORE fussy > about the need for > > attenuation than the non-"plus" variants (of the > "never actually work > > with a BT DS-3 delivered as standard" sort of > fussy). So yes you are > > probably wasting your time with an external CSU, > but you are also > > quite likely to need attenuators anyway. > > > > Alex > > > > > > > _______________________________ > Do you Yahoo!? > Declare Yourself - Register online to vote today! > http://vote.yahoo.com > > _______________________________ Do you Yahoo!? Declare Yourself - Register online to vote today! http://vote.yahoo.com

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Protected message
by ejay.hire＠isdn.net 20 Sep '04

20 Sep '04

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HSSI-adtran
by Philip Lavine 20 Sep '04

20 Sep '04

I am having a problem witha DS3 that terminates into a Adtran CSU (T3SU-300) and then into a 7200 with HSSI. I can not ping with a 0000 data pattern and I experience packet loss and errors when I pass TCP traffic. Adtran recommended an attenuator. What is the issue here? Is the signalling incompatible with a PA-T3+. Should I be wasting my time with an external CSU? thx __________________________________ Do you Yahoo!? New and Improved Yahoo! Mail - 100MB free storage! http://promotions.yahoo.com/new_mail

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Network, Shrimp Daddy has invited you to open a Google mail account
by Shrimp Daddy 20 Sep '04

20 Sep '04

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cisco source saga
by Eric Brunner-Williams in Portland Maine 20 Sep '04

20 Sep '04

This just made reuters: http://www.reuters.co.uk/newsArticle.jhtml?type=internetNews&storyID=628115…

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For sale - one telco
by Suresh Ramasubramanian 20 Sep '04

20 Sep '04

http://www.nytimes.com/2004/09/20/business/20phone.html?th > MCI, the troubled telecommunications company, has quietly begun > shopping itself to potential buyers, executives involved in the sale > process said yesterday.

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BGP Load Sharing
by Chris Strandt 20 Sep '04

20 Sep '04

I am hoping to learn from the great pool of experience on this list. We currently have 2 OC3 connections going to 2 seperate providers. We are using netflow statistics to balance our traffic flows (which outgoing is our major concern). Flow tools, snmp output, some custom scripts, and some bgp weighting does the trick. We are in the process of upgrading to Cisco 12012 GSRs, and adding additional connectivity. We need to find something we can use to do the same type of thing on the 12012 GSR. The custom scripts work fine.. but it appears some line cards don't support netflow. 1) Is there an open source software that will assist us in load sharing? 2) Are there specific cards we need for netflow on a 12000 series? Is the difference based on Line Card Engine (0,1,2,3,etc)? 3) Is there an alternate way to control outgoing traffic flow to multiple upstreams using bgp (besides splitting the address range up and blindly pointing chunks to each provider)? Thanks, -Chris Strandt Liquid Web Inc

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