This post is about fixing “%PM-4-ERR_DISABLE: pagp-flap error detected” error on Cisco switch Error log Root cause From the log, we can see the related ports just flap like crazy Fix Find out the reason for the physical connectivity issue. To configure auto recovery and extend the threshold, please use the command below: Useful link […]
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This post is to list out the compatible configuration to allow default VLAN1 traffic between Cisco and Juniper. In this post, let’s assume VLAN1 are used for Switch Management, yes it is bad practice 🙁 Single Connection Between Cisco and Juniper Cisco Juniper Please define your VLAN 1 as native vlan on the Juniper side:
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This post is about configuring VRRP between Fortinet Fortigate and Cisco Environment Fortigate firewall and Cisco router’s interfaces are configured using sub-interface, the physical interface will also work here. 100 is the VRRP Group ID FortiGate Firewall has a higher priority 255, so it will be the master Cisco Configuration Fortinet FortiGate Firewall Configuration As
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This post is about configuring LACP between FS and Cisco Switches. Environment * FS Switch end * Cisco Switch end * 4x 10G connection in between FS switch configuration ====Change the port speed to 10G as our Cisco 9300 can only support 10G ====Configure the LACP Cisco Switch configuration LACP status Useful links https://www.cisco.com/c/en/us/td/docs/ios/12_2sb/feature/guide/gigeth.html https://resource.fs.com/mall/file/user_manual/s5860-20sq-and-s5860-24xb-u-switches-configuration-guide.pdf
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This post is about configuring LACP between Juniper QFX (EVPN-VXLAN design) and VMware ESXi hosts. Environment *2x Juniper QFX 5120 Switches configured with EVPN-VXLAN, the design is a Collapsed Spine Fabric as described below: https://www.juniper.net/documentation/en_US/release-independent/solutions/topics/task/configuration/collapsed-spine-fabric-cloud-dc-configuring.html *If you connect your ESXi hosts directly to the QFX switches, you have to use LACP in between as this
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This post is a quick note about adding new VLAN/Port Group in vCenter, this includes Standard Switch and Distributed Switch. Environment *VMware Cluster with 3 and above ESXi nodes * vCenter Appliance configured with the VMware cluster *Standard Switch configured on VMware site *Top of Rack Switch Cisco Catalyst with configure as below, trunk port
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This post is about fixing Cisco C9200L-24P uplink Issue on IOS version 17.3.4b. Issue and Environment 1x Cisco 9200L-24P with 4x 10G SFP module Cisco 10G SFP uplink to another Cisco Core Switch IOS version is 17.3.4b on Cisco 9200L-24, it was the “recommended” version on Cisco website before Physical link between Cisco 9200L-24P and
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This post is to document the process of migrating VMware Standard Switch to Distributed Switch. The purpose of this change is to enable LACP on both VMware Hosts and Core/Top of Rack Switch. Environment Three-node cluster connected to Two-Switch stack with redundant connection for each switch On each switch port, it is configured with standard
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This post is about using iPerf to test link speed/bandwidth under windows environment. Environment 1 x Point to Point (MPLS) link provided by ISP 2 x Windows Server 2022 Server 64bit on each side of the link, Windows 10/11 will do the job as well iPerf3 downloaded on both Windows Servers from iPerf official link
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This post is to document the process to configure DHCP option 119 in Windows DHCP Server and Cisco Switch. Environment Windows Server 2022 Domain Controller with DHCP roles configured Windows 10 devices on the end user side Multiple Domains with two-way trust configured DNS Suffix needs to be configure for both domains: ICTFella.com and DomainAA.com
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