SECURITY

0 182
I often get a question how to protect IKE negotiation from being abused, overused or simply attacked. Here are some thoughts about it: IKEv1 is...

0 399
Recently, I've been asked by a customer for configuration of VRF aware IPSec. This particular case required Site-to-Site IPSec VPN where one Spoke has...

FAQ

0 212
Option 82 was designed to allow a DHCP Relay Agent to insert circuit specific information into a request that is being forwarded to a...

ROUTING & SWITCHING

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Unfortunately, no many people know about this great product that can be used in both lab environment and production for enterprise access scenarios and...

0 372
Cisco Services Router 1000V is a virtual router provided by Cisco that can run on VMware and it's perfect for everybody to check new...

0 260
Secure MAC Addresses You can configure these types of secure MAC addresses: Static secure MAC addresses - These are manually configured by using the switchport port-security...

DATA CENTER

0 218
Objective This tech note outlines the main differences in interface support between Cisco® NX-OS Software and Cisco IOS® Software. Sample configurations are included for Cisco...

0 235
Objective This tech note outlines the main differences in Hot Standby Routing Protocol (HSRP) (IPv4) support between Cisco® NX-OS Software and Cisco IOS® Software. Sample...

0 281
Objective This tech note outlines the main differences in Enhanced Interior Gateway Protocol (EIGRP) support between Cisco® NX-OS Software and Cisco IOS® Software. Sample configurations...

DESIGN CLINIC

0 228
Some people keep asking me about CCDE exam, how it looks like, how to prepare and most importantly how to pass it. Here I'd...

0 412
Overview For additional information regarding Overlay Transport Virtualization (OTV) on Cisco NX-OS devices, refer to the overview chapter available in the Cisco Nexus 7000 Series...

2 314
Many people keep asking me about Internet Edge for their Enterprise network: how to build it, what is currently in use, what are trends,...

SERVICE PROVIDER

0 217
Topology Configuration Configuration of the Headend Router (PE5): Example In the following example configuration of the headend router, note the following: IPv4 multicast routing is enabled with the...

0 198
MPLS MTU Values During Upgrade If you have configuration files with MPLS MTU values that are larger than the interface MTU values and...

0 234
In a normally routed environment, frames pass from a source to a destination in a hop-by-hop basis. Transit routers evaluate each frame's Layer 3...