Hi, You are correct you need a GLC-BX-D at one end and a GLC-BX-U at the other. GLC-BX-D -------> 1490nm ------> GLC-BX-U GLC-BX-D <------- 1310nm <------ GLC-BX-U So the light paths are split by a different wavelength in each direction allowing full duplex working on a single strand fibre.   Clever stuff :) ... View more

Hi,   Same TMG tool -- searched for 2960x-48fps https://tmgmatrix.cisco.com/?npid=654 Yes the GLC-BX-D is supported.       ... View more

Hi, Single strand fibre or as we call it here in the UK single fibre working. For the 3850 - Yes it is supported Here are a couple of links for you to explore. This is about many SFPs/Transceivers , the Single strand ones are in the "BX" range https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/gigabit-ethernet-gbic-sfp-modules/datasheet-c78-366584.html    You are then pointed at the SFP matrix and you will eventually land on the new Transceiver  module group tool TMG Put in some details about your switch like 3850, pick length of fibre, type of cable etc you then see what SFPs meet your requirements https://tmgmatrix.cisco.com/?ct=5&dr=8&rh=3&rh=18&si=3850   Hope this helps   ... View more

Hi AFO99, The mac address numbers are in hex. But HSRP groups are defined in Decimal. so Decimal HSRP group 37 = 25Hex 37/16 = 2R5 = 25Hex. "A" is correct ... View more

Hi, Try :- show proc cpu sorted Look at the top talker in this list to give a clue as to what is hogging the cpu. ... View more

Hi,   When a device send a frame to a switch the switch copies the senders MAC into its mac address table, IE MAC to interface MAP. The source & destination MAC are in the layer2 (data link) frame header Have a look at this link its explains the frame set up https://en.wikipedia.org/wiki/Ethernet_frame#Ethernet_packet_–_physical_layer The switch now knows that any frames destined for your MAC are to be sent to your port. Hope this helps you. ... View more

Hi, I think you will need to be more expansive with your NTP config May be try using the actual IP adds of the NTP servers & define the VRF - something like below   ! ! ntp server vrf Mgt-vrf 10.10.10.10 ntp server vrf Mgt-vrf 10.10.110.10 ! ... View more

Hi, If you find out whic port/interfaces are your uplinks you can exclude these port from your mac address table search sh cdp nei | ex SEP|ATA this will show all neighbors except CISCO PHONES/ATAs Now you can add the uplink ports as exclusions to your MAC search - something like this sh mac add | ex CPU|1/1/1|1/1/2 This would exclude my local CPU and my interfaces gig1/1/1 & gig 1/1/2 ... View more

Hi,   If you are having issues with this module have a read at this link https://www.cisco.com/c/en/us/support/docs/field-notices/643/fn64321.html May be you are being hit with that issue.. ... View more

Hi, To support up to 40KM on the 3850-XS you will need a GLC-EX-SMD SFP.   More info can be seen here:- https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/gigabit-ethernet-gbic-sfp-modules/product_data_sheet0900aecd8033f885.html   ... View more

Hi, You can find the NIM modules for your 4221 here:- https://www.cisco.com/c/en/us/products/routers/4000-series-integrated-services-routers-isr/relevant-interfaces-and-modules.html     ... View more