we have a core switch 4507RE at the data center and 2 departments that connect to it via 10Gig fiber using X2-LRM modules.
Each department has a 3 switch stack and both locations are identical w.r.t type and setup scenario ..
the stack comprises of 1 x 3750E and 2 x 3750G . uplink is from X2 port tengig3/0/1 from the 3750E switch.
all of a sudden dept B started facing problem , where the ping would break and throughput comes around 6 - 7 mbps from that dept to the server behind the core switch. we also noted CRC error on both sides preodically ... so ....
we replaced the multimode fiber patch cords, re did the splicing , which stopped the CRC errors to appear.
now since morning the uplink port on the 3750E (3/0/1) would suddenly be in "down" state with (err-disabled) as the status when i run sh int ten 3/0/1
and i can also see CRC errors and input errors on the same interface.. if i do shut / no shut .. the port is up and active again.. but this has happned 3 times today..
the core swith side is still OK and no CRC / input / output errors are seen..
now on the 3750E i have swapped the 10gig module from 3/0/1 to 3/0/2 . the port is still up but i can see 400 CRC and 500 Input errrors.....
the module is also OK as i had replaced it with dept 1's module....
any anyone please suggest what and how to check ... im totally blank .. which side has the problem ..... how to trace it
The Cisco 10GBASE-LRM Module supports link lengths of 220m on standard Fiber Distributed Data Interface (FDDI) grade multimode fiber (MMF). To ensure that specifications are met over FDDI-grade, OM1 and OM2 fibers, the transmitter should be coupled through a mode conditioning patch cord. No mode conditioning patch cord is required for applications over OM3. For additional information on mode conditioning patch cord requirements please see: http://www.cisco.com/en/US/prod/collateral/modules/ps5455/product_bulletin_c25-530836.html.
The Cisco 10GBASE-LRM Module also supports link lengths of 300m on standard single-mode fiber (SMF, G.652).
Also, with short distances, you might need an attenuator, otherwise the light sensors will be saturated and the module might overheat (which could lead to the errors you're describing and ultimately irreparable damage to the module).
Cisco recently announced the availability of the IOS-XE train – IOS-XE Cupertino 17.7.1. This is a standard maintenance release supporting switching, wireless, SP-Access, Routing as well as IoT (Internet of things) platforms with a sustaining support life...
What is AppQoE?
AppQoE is a WAN optimization stack and optimizes WAN traffic for different use cases for applications that are deployed on-prem or in cloud.
What are the benefits of using AppQoE?
AppQoE improves application experience by d...
The application delivery challenges have been the enemy of network since the advent of Internet. So, what are these application delivery challenges that can bring down a network to its heels?
Above are some of the common problems faced not only by tradit...
It is our pleasure to officially announce the finalists in the 2021 IT Blog Awards. Now we are looking to YOU, our amazing tech community, to weigh in. Check out the amazing educational content we've uncovered and vote for your favorites before Friday, Fe...