[c-nsp] 10gig Link Bouncing Consistently

Justin Krejci JKrejci at usinternet.com
Wed Apr 3 19:04:29 EDT 2013

Netgear SPF+ transceivers: AXM761


From: Justin Krejci
Sent: Wednesday, April 03, 2013 5:56 PM
To: Justin M. Streiner; cisco-nsp
Subject: RE: [c-nsp] 10gig Link Bouncing Consistently

This is what I've got

1. Optics in Cisco are vanilla cisco-compatible XENPAK-10GB-SR. Optics in the netgear are.... trying to find out.
2. OM2 fiber
3. Cable length is between 150 and 200 ft. OM2 should be good up to 150 meters @10 gig-e. The fiber is also pretty new, perhaps 2 years old.

For a second you had me worried as I had a sudden horrible feeling it was OM1 but its definitely OM2.

We are asking the customer about switching to SMF in any case as we avoid MMF as much as possible.


From: cisco-nsp-bounces at puck.nether.net [cisco-nsp-bounces at puck.nether.net] on behalf of Justin M. Streiner [streiner at cluebyfour.org]
Sent: Tuesday, April 02, 2013 7:44 PM
To: cisco-nsp
Subject: Re: [c-nsp] 10gig Link Bouncing Consistently

On Tue, 2 Apr 2013, Justin Krejci wrote:

1. What types of optics are being used on these links?
2. What type of multimode fiber (OM3/OM4?  hopefully not OM1...) is being
3. What is the distance between the devices, in terms of cable feet?


> We've a customer with two separate 10gig links to a pair of our
> 6509-E's. Both of our 6509-E's have dual Sup720-3BXL and the 6704-10GE
> line cards.
> Link 1: 6509 Router#1 routed port to Netgear#1. IPv4 only. Multimode
> fiber
> Link 2: 6509 Router#2 routed port to Netgear#2. IPv4 only. Multimode
> fiber
> The two Netgears are in a virtual stack. The 6509s are not.
> Netgear model: GSM7352Sv2
> Beginning several days ago both links began flapping every 5 and a half
> hours, both links have this happen within a couple of minutes of each
> other.
> They will flap for several minutes and then return to normal operation
> requiring no user action and the ports never enter err-disable or show
> any other symptoms.
> Our Ciscos log between 5 and 10 interface drops in the time frame.
> The Netgear switches log hundreds of interface drops in the same time
> frame.
> Further Details:
> We've replaced the transceivers on all endpoints.
> Light power levels are great at all end points.
> All other 10gig ports on the Ciscos are operating without issue, though
> they are all using single mode/LR optics.
> No other related log entries or other observed/reported issues anywhere
> else.
> On the Cisco's there are a some old interface errors but the error
> counters have not increased over the past several days.
> On the Netgears there are a few thousand FCS errors during the the few
> minutes of the problem occurring otherwise no errors ever.
> Sup720's are not failing over
> Beyond the very basic things the Ciscos are also doing OSPF and full BGP
> tables. IPv4 and IPv6 is in use. HSRP used in a few places, including
> these particular 10gig ports.
> Management is in a VRF.
> The peculiar thing is the regularity of 5.5 hour cycle which is obvious
> in the logs and in the traffic graphs.
> Both cisco ports are identically configured except hsrp priority and ip
> address.
> interface TenGigabitEthernet9/2
> ip address XXXX YYYY
> ip flow ingress
> ip flow egress
> standby 9 ip XXX
> standby 9 priority 105
> standby 9 preempt delay minimum 120
> standby 9 authentication md5 key-string 7 XXXX
> standby 9 track 1 decrement 20
> no cdp enable
> Is there some known issue or any suggestions at all at this point?
> Compatibility issues?
> An IOS upgrade seems to be another thing to try but in reading through
> the IOS SXI and SXJ release notes I don't see anything obviously
> related.
> Or maybe even just a reboot might help.
> Thanks for any advice.
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/
cisco-nsp mailing list  cisco-nsp at puck.nether.net
archive at http://puck.nether.net/pipermail/cisco-nsp/

More information about the cisco-nsp mailing list