Cisco Power cable type for South Korea

CAB-TA-EU  - Switch 3850

CAB-ACE    - Switch  2960X

%ADJ-5-RESOLVE_REQ_FAIL: Adj resolve request failed for

Today I faced an issue where lots of logs " %ADJ-5-RESOLVE_REQ_FAIL: Adj resolve request failed for " are generated on cisco 3750 switch.

It will not impact anything but logs keeps filling the buffer due to which some important logs can be overwritten.

This is due to bug "CSCug43307" in the IOS.

As an workaround use below command to stop these logs.

" no ip cef optimize neighbor resolution "

Difference between POE, POE+ and UPOE

Below is the quick summary of the differences between POE,POE+ and UPOE.

POE is the oldest standard for the devices which can be powered on from the switch. POE enabled switches can only provide upto 15W to the connected devices like phones.

Later on POE+ standard was evolved. Switches which are complied to POE+ standard can provide 30W of power to the connected devices.

Latest standard in this series is UPOE which is not a universal standard but a cisco Proprietary. According to which UPOE enabled switches can provide 60 W of power to the connected devices. Now we can power up not only phones but also PCs/Laptops from the switches.

Below are few more differences.

 

RJ45 to RJ45 Console Cable

I saw there is RJ45 to RJ45 console cable is available on Cisco site.  It has RJ45 connector at both the ends.

It looks like this:-

But How can we use it?

Can we connect it to our laptop's ethernet port?

   

Then, after lot of research I came to know that we cannot use this cable direct with laptop.

We have to have a RJ45 to DB9 connector (if DB9 is available on the machine) and another adaptor DB9 to USB incase DB9 is not available in your machine.            

RJ45 to RJ45 cable is used for access server with RJ45 ports like Digiport server or Blackbox console device to Cisco device connectivity.                 

The pinouts for RJ45 to RJ45 console cable is given below:-

Cisco EOL SFP's and its replacement

Cisco has announced EOL notification for many SFPs. Below are the few common Cisco SFPs and their replacement.

Baby Gaint Frame Vs Jumbo Frame...

Frames which are up to 1600 Bytes are called as Baby Gaint.

Ethernet frames from 1600 to 9216 Bytes are known as Jumbo frames.

OSPF configuration example on Nexus switches

Below is the OSPF configuration example on Nexus switches. Here OSPF is enable on the directly connected interface between 7K switches.

N7K-1:-

Step 1:- Enable OSPF feature

N7K-1(config)# feature ospf

Step 2:- Enable OSPF Process

N7K-1(config)# router ospf 10  --<<<< OSPF process ID N7K-1(config-router)# router-id 10.1.1.1

Step 3:- Enable ospf on particular interface

N7K-12-1(config-router)# int Eth1/1 N7K-2(config-if)#ip address 10.1.1.1 255.255.255.252 N7K-12-1(config-if)# ip router ospf 100 area 0

N7K-2:-

Step 4 :- Enable OSPF feature

N7K-2(config)# feature ospf

Step 5:- Enable OSPF Process

N7K-2(config)# router ospf 100  --<<<< OSPF process ID N7K-2(config-router)# router-id 10.1.1.2

Step 6:- Enable ospf on particular interface.

N7K-2(config)# int Eth1/1 N7K-2(config-if)#ip address 10.1.1.2 255.255.255.252 N7K-2(config-if)# ip router ospf 100 area 0

Step 7 :-  Optional- Below command can be used if we want to disable the neighborship on particular interface.

N7K-1(config)# int Eth1/1 N7K-1(config-if)# ip ospf 100 passive-interface ---< To disable neighborship but still advertise the network N7K-1(config-if)# ip ospf network point-to-point --<< To change the network type

Verification :-

A. Show ip ospf neighbor

N7K-1# sh ip ospf neighbors  OSPF Process ID 100 VRF default  Total number of neighbors: 1  Neighbor ID     Pri State       Up Time  Address      Interface  100.1.1.2         1 FULL/ -     00:00:08 100.1.1.2       Eth1/1