Rapid-spanning-tree is an enhanced 802.1d standard. The differences: Only waits for 3 missed Hello’s instead of 10 Hello’s (maxage timer) Transitioning from disabled state to learning state (skipping the Listening state) uses some other port types Max Age Max Age is refreshed every time the port receives a BPDU PVST i. non-designated ports will …
Category: Cisco
Permanent link to this article: https://daherlabs.mywire.org/wordpress/?p=353
Apr 03 2015
Encapsulation Overhead
There are variuos methods to encapsulate and tunnel traffic. Each one of these protocols adds an “envelope” to the packet which means more overhead and a bigger packet size. Here are a few of these protocols: Protocol Overhead Bytes IP 20 UDP 8 TCP 20 802.1Q 4 OTV 42 VXLAN 50 STT 54 GRE …
Permanent link to this article: https://daherlabs.mywire.org/wordpress/?p=606
Mar 24 2015
EIGRP Stub Statement
EIGRP – Stub Routing Stub routing is an EIGRP feature primarily designed to conserve local router resources, such as memory and CPU, and improve network stability. The stub routing feature is most commonly used in hub-and-spoke networks. This feature is configured only on the spoke routers. When configured on the spoke router, the router announces …
Permanent link to this article: https://daherlabs.mywire.org/wordpress/?p=597
Mar 28 2014
Routing over Nexus 7000 vPC peer-link? Yes and No. : BRAD HEDLUND
Summary The Nexus 7000 hardware has loop prevention logic that drops traffic traversing the peer link (destined for a vPC member port) when there are no failed vPC ports or links. Normally peer-link traffic is non-existent in a normal network and this is never a problem for attaching normal Layer 2 switches or servers. However …
Permanent link to this article: https://daherlabs.mywire.org/wordpress/?p=434
Feb 19 2014
Cisco UCS SAN Boot
If you have a Cisco UCS system, you probably want to do SAN boot. It is a simple, and quick task to perform. This is a follow up to an earlier post on UCS with local FC storage. Just remember that boot order changes require a reboot of the Service Profiles and associated blades. …
Permanent link to this article: https://daherlabs.mywire.org/wordpress/?p=391
Feb 13 2014
Cisco Wireless Application Visibility
If you have Cisco Wireless Lan Controllers (WLC) version 7.4 and newer, there is a nice new feature called “Application Visibility” that you can turn on per SSID. There are only a few steps to enable this feature and get visibility into your wireless network. You must do this on every WLC in your network …
Permanent link to this article: https://daherlabs.mywire.org/wordpress/?p=386
Feb 05 2014
Cisco 8510 WLC Enable 10G Ports
We are in the process of installing 2 Cisco 8500 wireless controllers. After going through the initial configuration, we noticed that the ports Link Status on the 8500 controller showed Down and we were unable to ping our controllers: (Cisco Controller) >show stats port sum Link …
Permanent link to this article: https://daherlabs.mywire.org/wordpress/?p=358
Feb 05 2014
PVST+ Spanning-tree Summary
Roles Bridges: root non-root Ports: Root Port (RP) Designated Port (DP) Non-designated Port (NDP) Overview For each VLAN choose one root bridge The switch with the lowest Bridge ID (BID) BID consists of 4-bit priority value (multiple of 4096) + 12-bit VLAN ID + MAC address Priority defaults to 8 (8 * 4096 = …
Permanent link to this article: https://daherlabs.mywire.org/wordpress/?p=311
Feb 03 2014
Cisco UCS with FC Local Storage
If you are trying to add FC storage to your UCS environment, you can quickly do so by connecting a storage server using FC staright into the Cisco UCS 6100 Series Fabric Interconnects. I have in the past used Openfiler, Nexenta and now use Tegile as my storage platform. Here is a quick guide to …
Permanent link to this article: https://daherlabs.mywire.org/wordpress/?p=332
Jan 29 2014
Cisco Nexus resource links
Command References and Configuration Guides and White Papers Nexus 7000 Configuration Guides Nexus 7000 Command References Configuring Q-in-Q VLAN Tunnels Configuring vPCs Nexus 7000 NX-OS Release Notes Nexus 7000 Configuration Examples and Tech Notes Nexus 7000 NX-OS/IOS Comparison Nexus 7000 CLI Management Best Practices Nexus 7000 Scalability Limits Nexus 7000 White Papers Nexus …
Permanent link to this article: https://daherlabs.mywire.org/wordpress/?p=251
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