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Licensing Installation Issues

Error Message: LICMGR-3-LOG_LIC_INVALID_HOSTID: Explanation: The feature has a license with an invalid license Host ID. This can happen if a supervisor module with licensed features for one system is installed on another system. Recommended Action: Reinst…

Unable to configure vPC

In this blog you will see the solution when you are configuring the VPC , the Nexus not allow to configure the vPC. Some of the possible cause has been discussed here : Possible Cause vPC is not enabled or is not supported in the NX-OS release of software…

intermittent network connection BGP/ Eigrp Routes issue.

Issue: intermittent network connection BGP/ Eigrp Routes issue. Temporary solution: – Both switches need to be rebooted each time issue occurred. Affected IOS used on both switch was: cat4500e-entservicesk9-mz.122-53.SG.bin Fixes :- BUG: CSCsy92331 …

VPN connectivity between dr-vpn01 and R01-VPN05 “EIGRP” is flapping

VPN connectivity between dr-vpn01 and R01-VPN05 “EIGRP” is flapping Solution : dr-vpn01(config)#interface GigabitEthernet0/0 dr-vpn01(config-if)#no crypto map MAP-TO-FO dr-vpn01(config-if)# crypto map MAP-TO-FO dr-vpn01#sh ip ei nei EIGRP-IPv4…

%SUPQ-4-CPUHB_RECV_STARVE: Still seeing receive queue stuck after throttling

We had opened the CISCO TAC case to understand more about this error, But based on search we found that this Error was most Probable cause for MAC address Loops as result of STP Topology failure . This is based upon the following Cisco BUG related to erro…

Slow Performance on Specific AP

This Blog explains troubleshooting steps to find out cause of slow performance on specific access point. 1. From User’s location information, it is easier to find out WLC details either from Visio or WCS. 2. In WCS, Click Monitor>Controller to get the c…

How pxe works in datacenter

PXE works with Network Interface Card (NIC) of the system by making it function like a boot device. The PXE-enabled NIC of the client sends out a broadcast request to DHCP server, which returns with the IP address of the client along with the address of t…

understanding tacacs-server directed-request command

I find people getting confused on understanding command “tacacs-server directed-request” on Cisco IOS routers. Lets have a look how does it behaves. Suppose we have two tacacs servers configured on a router. tacacs-server host 10.0.0.1 tacacs-…

bootflash and sup-bootflash in Cisco 6509 switch

In my production environment I went through a case where I noticed a behavior of Cisco 6509 switch in which there were bootflash and sup-bootflash where IOS images can be stored and then set the boot variable on either of these. In this switch there was a…

Internet routers hitting 512K limit, some become unreliable

Internet routers hitting 512K limit, some become unreliable At the heart of the issue, the growth of routable networks on the Internet overwhelmed the amount of memory set aside in infrastructure hardware, typically routers and switches, that determines t…