Troubleshooting Cisco Network Elements with the USE Method
I want to draw some attention to a new document I’ve written titled “Troubleshooting Cisco Network Elements with the USE Method“. In it, I explain how I’ve taken a model for troubleshooting a complex system–the USE Method, by Brendan Gregg–and applied it to Cisco network devices. By applying the USE Method, a network engineer can perform methodical troubleshooting of a network element in order to determine why the NE is not performing/acting/functioning as it should.
I ask that if you’re familiar with a given Cisco network platform (or platforms), that you please contribute commands that would also fit into the USE Method! My list is just a start and I welcome contributions from others in order to make it a stronger, more valuable reference.
Please check out the guide: Troubleshooting Cisco Network Elements with the USE Method
Original article: Troubleshooting Cisco Network Elements with the USE Method
Copyright © 2017 Joel Knight . All Rights Reserved.
SDxCentral’s Top 10 Articles — July 2017
Juniper gets a new CTO from Google; Find out how Cisco's intent-based networking works.
What is IPv6 Dual stack? What does IPv6 dual stack exactly mean?
What is IPv6 dual stack ? From some questions and comments on the website, I understand that there is a confusion about it. So, what does exactly dual stack IPv6 mean ? IPv6 is not a luxury anymore. It is not avoidable for the Service Providers especially. The biggest problem for the Service Providers […]
The post What is IPv6 Dual stack? What does IPv6 dual stack exactly mean? appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
14 Storage Startups Breaking New Ground
Check out these new vendors that are driving innovation in enterprise data storage.
Why ALL African Internet and Data operators should be attending AfPIF-2017
Top African and international Internet companies are supporting this year’s Africa Peering and Interconnection Forum (AfPIF), set for August 22-24 in Abidjan, Ivory Coast.
Netflix, Facebook, Google, Akamai, DE CIX, LINX, YAHOO, Netnod and FranceIX are among the global players supporting AfPIF while Liquid Telecom, Seacom, Angola Cables, Angonix, AFRINIC, and MainOne are the leading supporters from Africa.
In the last seven years, AfPIF has established itself as the most important Internet event with respect to peering and interconnection in Africa and any operator that is looking at growing their local, regional and global interconnection is best served at AfPIF.
Michuki Mwangi
Configuring Voice VLANs
Today I am going to talk about the Voice VLAN. The Voice VLAN feature enables the VLAN to carry the voice traffic. So you have a switch with is connected to the IP Phones, it can be of Cisco Avaya or any other and is connected to the specified VLANs or you can name them Voice VLANs in your network. So when switch is connected to the IP phones, the connected switch sends the voice traffic with layer 3 IP precedence and Layer 2 class of service in short name as COS values which are set as default of value 5. That is the reason because the sound quality of an IP phone call can deteriorate if the data is unevenly sent, the switch supports quality of service (QoS) based on IEEE 802.1p CoS.
 |
| Fig 1.1- Sample Topology- Switch and IP Phone |
We can configure an access port with an attached Cisco IP Phone to use one VLAN for voice traffic and another VLAN for data traffic from a device attached to the phone. We can configure access ports on the switch to send Cisco Discovery Protocol (CDP) packets that instruct an attached phone to Continue reading
The Languages Which Almost Became CSS
This was adapted from a post which originally appeared on the Eager blog. Eager has now become the new Cloudflare Apps.
In fact, it has been a constant source of delight for me over the past year to get to continually tell hordes (literally) of people who want to – strap yourselves in, here it comes – control what their documents look like in ways that would be trivial in TeX, Microsoft Word, and every other common text processing environment: “Sorry, you’re screwed.”
— Marc Andreessen
1994
When Tim Berners-Lee announced HTML in 1991 there was no method of styling pages. How a given HTML tag was rendered was determined by the browser, often with significant input from the user’s preferences. To Continue reading
Troubleshooting Cisco Network Elements with the USE Method
I want to draw some attention to a new document I've written titled “Troubleshooting Cisco Network Elements with the USE Method". In it, I explain how I've taken a model for troubleshooting a complex system-the USE Method, by Brendan Gregg-and applied it to Cisco network devices. By applying the USE Method, a network engineer can perform methodical troubleshooting of a network element in order to determine why the NE is not performing/acting/functioning as it should.Troubleshooting Cisco Network Elements with the USE Method
The USE Method is a model for troubleshooting a system that is in distress when you don't know exactly what the nature of the problem is. For example, if users within a specific part of your network are complaining of slowness, disconnects and poor application performance, you can probably isolate your troubleshooting to 2-3 switches or routers. However, since the problem description is so vague (we all love the “it's slow!EVPN-VXLAN lab – basic L2 switching
My EVPN-VXLAN lab topology:
There is IP Fabric in DC1 (2 vMX and 2 vQFX), and 2 vMX_v14 to emulate CE devices. Each CE device connected to EVPN via LACP LAG ae0 (EVPN Active-Active ethernet segment on service side). vMX_old-1 also has sigle-homed interface ge-0/0/4 (just to show you the difference).
Each CE device split into two logical systems for more convenient testing of routing functionality (global device context for Vlan100 and logical-system second for Vlan200). You could also use virtual-router routing instances for that, if you prefer this way. The rest of CE config is pretty self-explanatory:
alex@MX1# show interfaces
ge-0/0/0 {
description vMX1;
gigether-options {
802.3ad ae0;
}
}
ge-0/0/1 {
description vMX2;
gigether-options {
802.3ad ae0;
}
}
ge-0/0/4 {
description vMX1_second;
flexible-vlan-tagging;
encapsulation flexible-ethernet-services;
mac 00:46:d3:04:fe:06;
}
ae0 {
description to_MC-LAG_vMX;
Continue reading
ge-0/0/0 {
description vMX1;
gigether-options {
802.3ad ae0;
}
}
ge-0/0/1 {
description vMX2;
gigether-options {
802.3ad ae0;
}
}
ge-0/0/4 {
description vMX1_second;
flexible-vlan-tagging;
encapsulation flexible-ethernet-services;
mac 00:46:d3:04:fe:06;
}
ae0 {
description to_MC-LAG_vMX;
Continue reading
Worth Reading: LinkedIn passes an IPv6 milestone
The post Worth Reading: LinkedIn passes an IPv6 milestone appeared first on rule 11 reader.
Data Center Physical Realities in a Software-Defined World
A company's ability to leverage software depends on efficient infrastructure.