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SDN

SDN is software defined Network SDN is software defined network SDN is software defined network SDN is software defined network

eth_bypass WAE 10.5.76.18 Major The interface InlinePort 1/1/wan is in bypass mode.

Mechanical bypass mode prevents the WAE from becoming a single point of failure and allows traffic to continue to flow between the router and the client while it passes through an unresponsive WAE without being processed.   Should Check on WAE that M…

Understanding OSPF LSA Type-4

Every one who are at this position of preparing for CCIE lab must know about all ospf LSA Types. However LSA Type-4 always remains mysterious and confusing for many of us. So let’s discuss on this LSA Type. Consider a small ospf domain for better un…

Configuring SNMP on Nexus Devices

Step1. Create object group for the interface used by SNMP server to poll the device. In this example we use the IP address of management interface. We have given the name snmp-Interface to management interface. It is basically a IP to name mapping.  …

Configuring Fabricpath

N7K1 ( config) # install feature-set fabric-path N7K1 ( config) # feature-set fabric-path   N7K1 ( config) # Interface vlan 10 N7K1 ( config-if) # mode fabric-path   N7K1 ( config) # Interface e1/4 ( on Fabric-path Core-ports) N7K1 ( config-if) # switch…

Making VDC on N7K

N7K1-1( config) # no vdc combined-hostname N7K1-1 #  vdc N7K1-2 N7K1-1 ( config – vdc) #  allocate interface  e1/9-16   Configuring ha policy : N7K1-1 ( config – vdc) #  ha-policy single-sup bringdown/reload/restart dual-sup  bringdown/restart/ …

Replacement of one N5k switch in vPC

An year back I was given an opportunity of replacing a N5K switch from vPC. Some of the physical connectivity was already there, here is what I performed from the start. Before this change I also referred Cisco documents but in documents there are several…

Configure and Troubleshoot GRE over IPsec VPN with NAT device in between

IPsec is a complex technology and it becomes more complex when a NAT device is in the path between a site to site GRE over IPsec VPN. In my production environment a problem escalated to me stating that site to site IPsec tunnel had not been coming up. Whe…

HSEC-K9 requirement on ISR G2 routers

I came across a scenario where a site was facing slowness, this site was having edge Cisco router 2951 configured with two GRE over IPsec tunnels towards the Data Center. One tunnel was being used as primary and other as secondary for data traffic. Users …

FEX 2000 AA Mismatch

We installed two nexus 5500 switches with different NXOS . N5K1 has 5.2.1.N1.4.bin and another N5k2 has n5000-uk9.5.1.3.N1.1a.bin. As soon as we connected the Nexus 2000 fex in to it , it gave error :   Error : AA Version Mismatch 101 FEX-TOP-Rack1 A…