Want to sell your brand to a developer? Laptop stickers could be yet another way!
© Arun Sriraman |
© Arun Sriraman |
A few years ago I was approached by a state organization to be a second set of eyes for a large purchase of Cisco routers and access points to connect all its branch offices to a new central hub. Most hardware line items were Cisco 2921s and 2951s and Aironet 1041s. I asked how many […]
The post How Rightsizing A Network Saved Millions appeared first on Packet Pushers.
A few years ago I was approached by a state organization to be a second set of eyes for a large purchase of Cisco routers and access points to connect all its branch offices to a new central hub. Most hardware line items were Cisco 2921s and 2951s and Aironet 1041s. I asked how many […]
The post How Rightsizing A Network Saved Millions appeared first on Packet Pushers.
Cisco announced their new Digital Ceiling initiative today at Cisco Live Berlin. Here’s the marketing part:
And here’s the breakdown of protocols and stuff:
Funny enough, here’s a presentation from just three weeks ago at Networking Field Day 11 on a very similar subject:
Cisco is moving into Internet of Things (IoT) big time. They have at least learned that the consumer side of IoT isn’t a fun space to play in. With the growth of cloud connectivity and other things on that side of the market, Cisco knows that is an uphill battle not worth fighting. Seems they’ve learned from Linksys and Flip Video. Instead, they are tracking the industrial side of the house. That means trying to break into some networks that are very well put together today, even if they aren’t exactly Internet-enabled.
Digital Ceiling isn’t just about the PoE lighting that was announced today. It’s a framework that allows all other kinds of dumb devices to be configured and attached to networks that have intelligence built in. The Constrained Application Protocol (CoaP) is designed in such a way as to provide data about a great number of devices, not just lights. Yet lights are the launch Continue reading
University network borders tend to be more complicated than those in similarly sized corporate organizations. I recently helped a peer from another university transition from IOS to Junos for border routing. While most of the configuration was straightforward, he required a unique conditional routing policy. Since I’ve been working with Junos for many years (starting […]
The post Junos Conditional Route Advertisement appeared first on Packet Pushers.
University network borders tend to be more complicated than those in similarly sized corporate organizations. I recently helped a peer from another university transition from IOS to Junos for border routing. While most of the configuration was straightforward, he required a unique conditional routing policy. Since I’ve been working with Junos for many years (starting […]
The post Junos Conditional Route Advertisement appeared first on Packet Pushers.
Networking pros should aspire to the continuous deployment model used by application developers.
25 Gigabit Ethernet provides companies with a cost-effective option for meeting increased bandwidth demand.
Mr. A. Anonymous left this comment on my BGP in the data centers blog post:
BGP is starting to penetrate into servers as well. What are your thoughts on having BGP running from the servers themselves?
Finally some people got it. Also, welcome back to the '90s (see also RFC 1925 section 2.11).
Read more ...For “basic” multicast I have always found that >70% of the problems I troubleshoot end up being the same things over and over and over again.
Thank you, vBrownBag for asking me to present this. It was lots of fun.
Vendor: Cisco
Software version: 12.2(33)SXI7
Hardware: 6509-E
So this is a typical stupid question. How do you add VLANs to a trunk?
Assuming you started with a port with default configuration on it, it would be:
interface switchport switchport mode trunk switchport trunk encapsulation dot1q switchport trunk allowed vlan switchport trunk native vlan
Now, I was interrupted while doing this by someone interjecting and stating categorically, that
switchport trunk allowed vlan ```
Should be:
``` switchport trunk allowed vlan add ```
Not really the way I would do it on a new switchport, but not wanting to hurt feelings I proceeded and saw this:
``` TEST(config-if)#switchport trunk allowed vlan add 10,20,30 TEST(config-if)#do show run int gi9/14 Building configuration...
Current configuration : 279 bytes ! interface GigabitEthernet9/14 description TEST switchport switchport trunk encapsulation dot1q switchport mode trunk shutdown storm-control broadcast level 0.50 storm-control multicast level 0.50 no cdp enable no lldp transmit no lldp receive end ```
To cut a long story short, the switch takes the configuration, but doesn’t apply it. It lead to a lot of head scratching, because you’d think it should work. Switchport state when doing:
``` show interface gi9/14 trunk ```
Shows a state Continue reading