AlwaysTheNetwork
Just another Cisco blog
show ip ospf rib
Mar 3rd
Another quick one. Today I’m going to cover a simple, but very useful OSPF command: “show ip ospf rib”. This command is similar to “show ip route ospf”, but goes a bit deeper.
If you’ve ever done a routing protocol migration, you know how important it can be to see each protocol’s full routing table. Much of the time AD makes this difficult. Administrative Distance (AD) is the believability of a routing protocol on a Cisco device. The default AD values are:
Route Source |
Default Distance |
| Connected Interface | 0 |
| Static Route | 1 |
| EIGRP Summary | 5 |
| eBGP | 20 |
| Internal EIGRP | 90 |
| IGRP | 100 |
| OSPF | 110 |
| IS-IS | 115 |
| RIP | 120 |
| EGP | 140 |
| ODR | 160 |
| External EIGRP | 170 |
| iBGP | 200 |
| Unknown | 255 |
Firewall Object Groups
Mar 2nd
Dropping in to do a quick post today. Sorry for the ridiculous lack of content lately. I’ve been busy with finding/changing jobs and new responsibilites and all that.
Today I’m going to cover “object groups” on ASAs. I was never a big fan of these, which I realized had a lot to do with using them behind others, not actually writing them myself. It takes awhile (for me, at least) to wrap your head around what the person before you was trying to accomplish. This is what put me off object groups. Though, I discovered that if I write them myself, I love them, lol. They can be hugely useful. They’re even available in IOS now (as of 12.4(20)T). Here’s an example of when they’d be used:
Testing link/circuit speed using Iperf
Sep 18th
Hi all!
It’s Jared from CCNPJourney.com. Colby had asked me a couple weeks ago if I would be interested in posting some articles on his blog as he’s been fairly busy lately, and of course I said yes. So I thought for my introductory post on the blog I would do a brief write-up on how to use Iperf!
For starters here’s a little bit of info on Iperf. Iperf is a tool that many system/network admins use to measure the bandwidth on a network, as well as the quality of the path on that network. It is capable of generating traffic using TCP and UDP. The TCP and UDP tests are useful for performing the following kinds of tests:
- Latency (response time or RTT): can be measured with the Ping utility.
- Jitter: can be measured with an Iperf UDP test.
CCNA Scholarship
Sep 16th
Steve is doing another generous offering over at Networking Forum. He’s planning to give away a “scholarship” for the CCNA. He will essentially pay someone’s way through the CCNA if this person agrees to log his or her progress on the forum. We, the staff and member base, are also offering our guidance and support throughout the process. Here’s a snippet from the forum:
What’s going on?
networking-forum.com is offering a scholarship to one person who would like to earn a Cisco Certified Network Associate (CCNA) certification. The scholarship will provide the CCNA Official Exam Certification Library, a separate forum specifically dedicated to the candidate for his or her use during their studies with feedback from the site’s members, and reimbursement of the exam fees after they pass their exam(s).
How is the recipient chosen?
Fiber Woes
Sep 7th
I’m in the process of doing a very large hardware refresh for my company. We’re replacing 100+ old/EOL switches throughout the network/country. This shouldn’t be too big of a deal, but the latest generation of Cisco switches use SFPs. The older stuff is all GBIC. For most of our large sites, this isn’t major as we just run an ST to LC cable from the patch panel to the switch…
But of course, there are random sites without patch panels. The fiber runs directly from switch to switch. This presents a problem as we don’t have detailed information for most of our sites. So the options are re-terminating the ends of the fiber, buying a long enough patch cable (difficult to do) or having someone come out and pull new runs. That was until I came across these:
Tripp Lite N458-001-50 Duplex Multimode 50/125 Fiber Adapter, LC-M/SC-F – 1ft
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