Category Archive Routing and Switching

Configuration of Stacked Access Switches Solutions

Cisco Catalyst Switch Stacks A switch stack is a set of up to nine Catalyst 3750, 3750-E, 3750-X switches connected through their StackWise ports, or up to four 2960-S switches connected through their FlexStack connectors. One of the switches controls the…

Configuring LLDP & LLDP-MED

LLDP is an open standards based equivalent of CDP.  It is also known also as 802.1AB. If a non Cisco IPT solution is being implemented it may be necessary to configure LLDP-MED. Non Cisco IPT solutions traditionally used DHCP as the mechanism for the pho…

Catalyst 4500 Supervisor 7-E and Supervisor 7L-E ISSU Procedure

There are two methods of performing an ISSU upgrade: a four command procedure and a one command procedure. This section details how to use the one command version. The ‘quick’ option is not used as it not recommended in the installation notes due to i…

Catalyst 4500 Supervisor 6-E and 6L-E

The uplinks on the Supervisor Engine 6-E have three options in redundant mode operation:- 1 + 1 redundancy In this configuration, only one 10 Gigabit Ethernet uplink port on each of the two supervisor engines carries traffic, and each port forwards traffi…

Troubleshooting application problem on WAAS

In order to troubleshoot an application problem on WAAS can be easy if we follow the follow steps. First we need to gather the information about the problem Check whether the problem in all application or single application (i.e. CIFS, HTTP) Try to get th…

Network Connectors, SFP and Cables

It is very Essential to know about the connectors, SFP and cable type if you want to be an expert in the networking field. I have taken out some of the well known connector, SFP and cable types. That will give you enough idea on what type of connectors ar…

%SYS-4-CHUNKSIBLINGSEXCEED: Number of siblings in a chunk has gone above the thr

Issue : %SYS-4-CHUNKSIBLINGSEXCEED: Number of siblings in a chunk has gone above Cause : This is due to leaking within Crypto Request chunk. and to a commonly hit bug which can be viewed using by bug toolkit on CCO: CSCtw80533 Memory leak due to crypto_al…

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…