Category Archives: CCNP
First Hop Redundancy Protocol – HSRP
Cisco proprietary HSRP protocol is a protocol for enabling a first hop fault tolerant router. Enabling your default gateway ip address to ‘live’ on more than one router. Back in the old days you had one router to exit a … Continue reading
Access-list mask or wildcard
G’day all, today I was messing around with access-list. And after getting my head around the weird subnets of rfc1918. Weird as in an A-class (/8) is reserved in A-space, B-class (/16) in reserved in C-space, and for the B-space … Continue reading
Policy Based Routing
Policy-Based routing is a neat trick to tweak traffic streams. For Policy Based Routing to work you will the following; – Define traffic stream in an access-list. – Write down a policy. – Determine the inbound interface. First use an … Continue reading
Error-Disable
When a network port encounters an error. This port is automatically shutdown to ensure network stability. When error-disable is enabled. The predefined error are as follows; arp-inspection bpduguard channel-misconfig dhcp-rate-limit gbic-invalid l2ptguard link-flap mac-limit link-monitor-failure loopback oam-remote-failure pagp-flap port-mode-failure psecure-violation … Continue reading
SSH error on cisco router
Enabling SSH on a Cisco router is not enough to guarantee SSH is working. Enabling ssh version 2.0 on a routers is as straight forward as;. >ip ssh version 1-2 I surely recommend the use of version 2, because ssh … Continue reading
DHCP Helper address
Which source ip address is used when relaying a dhcp-request ? Continue reading
Extended IP Access-list
As we all have learned in our pursuit to CCNA there are many different types of access-list. In reality most commonly used are ip access lists. Major difference between ip standaard access-list an ip extended access-list is the ability to … Continue reading
