Category: Cisco
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Cisco DMVPN With DHCP Failure
With Cisco’s DMVPN it should be a snap to pickup your router and move it to a new site…at least it was previously for my client. The difference was, they were statically configured before, and now they are DHCP. Cisco Dynamic Multipoint VPN is a system where by you plug in, and remote sites will…
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Cisco CMP – Out Of Band Built Into Your Router
Today I had a customer ask us for assistance in configuring their CMP on their Cisco Sup2T for a 6500 chassis. To which I promptly googled it hehe. A CMP is the Connectivity Management Processor, AKA out of band manager. This is similar to IPMI in the server world. It lives on inside the supervisor,…
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Trunking To A Nexus Switch
I’m using a Nexus 5020, and attempting to trunk a 7606 running service provider code…but for some reason VLANs aren’t passing. I issue the following on the 7606: 7606#show int te1/1 trunk Port Mode Encapsulation Status Native vlan Te1/1 on 802.1q trunking 1 Port Vlans allowed on trunk Te1/1 1650-1699 Port Vlans allowed and active…
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Cisco BGP Prepend All Routes – The Lazy Way
One man’s lazy is another man’s efficient. I’m the most efficient guy you know 😛 Prepending is adding your AS number to BGP NLRI multiple times to make a set of routes look further away and thus less preferred. Without Prepending: Router# show ip bgp 1.1.1.0/24 BGP routing table entry for 1.1.1.0/24, version 555663701 65001…
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Cisco DHCP Snooping With Mikrotik Version 6
I’ve written an extensive article here about Layer 2 protection on wired networks. I would reference this first for full details. In a nutshell DHCP snooping prevents a user from acting as a rogue DHCP server. It also builds a binding table that can be used with ARP inspection to prevent man in the middle…
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Cisco Call Manager Express/Communications Manager Express, Cheap FXS/FXO Ports, and Asterisk Voicemail
Here’s the scenario. I’ve got a charter school that has an aaaaaaancient PBX kicking a PRI. Having the system updated is expensive and the PRI is even more expensive. We are going to roll a new PBX for them in about 8 months, and their PRI’s contract is coming up soon. This is a perfect…
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Shutdown And Enable Radios On A Cisco Wireless LAN Controller
So I’m about to do some work with Ubiquiti in an environment that has a decent chunk of Cisco gear controlled via WLC. I want to kill allllll of the Cisco radios at once so I can do some spectral analysis before I do a complete transition. I found a few commands that will help…