Routing

CCIE R&S Written - Epic Fail (Again)

2013-07-07 ·2 min read

Yes, I failed. I think it’s pretty typical when you’re at Cisco Live, you stay out drinking and smoking cigars until 01:00, then you sit the exam at 08:00 the next morning. Considering the …

ccie fail routing switching written

Junos Basics - Routing Instances

2012-11-01 ·3 min read

Here’s one that I use every day at work. We have multiple customers coming into the same router, and, as luck would have it, they all use 192.168.1.0/24 (OK…not really but it might …

instance juniper junos route routing table vrf

CCIE R&S Written - Epic WIN!

2011-08-24 ·3 min read

The wife and I had a romantic day driving several hours to a small town to take Cisco exams. If this doesn’t get me some action, I don’t know what else to try. I’ve already used the …

350-001 ccie cisco rs routing switching written

CCIE R&S Written Materials

2011-06-13 ·2 min read

I’m scheduled to take the CCIE R&S Written exam on 10 July at Cisco Live, and I’ve been asked by a handful of people on Twitter exactly what materials I’m using. I figured it …

350-001 books ccie materials routing study switching written

Tagging External Routes in EIGRP

2010-12-03 ·2 min read

EIGRP allows you to tag external routes. That is, any route redistributed into EIGRP can be tagged with a numeric descriptor from 0 to 4294967295.

bgp egp eigrp external igp ospf redistribution route routing tag

SLA Monitoring on the PIX/ASA

2010-10-15 ·5 min read

We’re working on an data center design for a customer, and they’ve dropped in two ISP links - each with it’s own managed router and public IP space off one of the Ethernet …

asa icmp ip-sla monitor ping reliable route routing sla static

ROUTE Notes - Branch Office Routing

2010-07-05 ·2 min read

Corrigeme, por favor. Study Notes What do IPSec tunnels give you when a branch office is on a broadband connection? Privacy through encryption Authentication of the remote peer through ISAKMP Delivery …

642-902 branch ccnp certification cisco route routing

ROUTE Notes - PBR and IP SLA

2010-06-24 ·4 min read

Feel free to correct. Study Questions What’s the most primitive way to get traffic destined to a single host to use a different path than your dynamic IGP dictates? Use a static route. …

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Renesys Analysis of SuproNet Announcement Debacle

2009-02-18 ·1 min read

Earl Zmijewski of Renesys has an analysis of the SuproNet incident that took down a good bit of the Internet on Monday. From the blog: This single Czech provider announcing a single prefix caused a …

bgp bgp-internet routing

Cheat Sheets from Packetlife.net

2008-05-28 ·1 min read

My friend Josh over at blindhog.net has found a collection of cheat sheet gems for the network dude(tte). There’s sheets on BGP, OSPF, Subnetting, QoS, connector types, and more. Check it out. …

eigrp lan qos routing switching vlans vpn