Here’s a handy list of ACL entries to allow your devices to speak routing protocols, availability protocols, and some other stuff. We’ll assume you have ACL 101 applied to your Ethernet inbound; your Ethernet has an IP of 192.168.0.1. BGP : Runs on TCP/179 between the neighbors access-list 101 permit tcp any host 192.168.0.1...
Posts Tagged ‘ hsrp ’
Object Tracking and HSRP
We’ve done some tracking with HSRP in other articles, but there are lots and lots of ways to use object tracking on an HSRP device. In our example network, we tracked the interface, and, if it went down, we decremented the standby priority. What if just the line protocol goes down? How about if...
HSRP Interface Tracking
Remember the article on router-on-a-stick? And the one on HSRP? Let’s add to that example network, shall we? Let’s make those routers into edge routers so they connect your internal network to the Internet with some size circuit. Let’s just say they each terminate DS3s to different providers. Here’s our network now (I’m experimenting...
Running HSRP for Availability
In the article describing a router-on-a-stick, I mentioned that I would use two routers that run HSRP for availability, so I figured that I would write up a short post on what it is and how it works. HSRP (Hot Standby Router Protocol) is a Cisco-proprietary protocol for establishing two or more layer-3 devices...
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