CCIE L2 Ep.2 - 4reyouSmart_or_hubs.1Q
Topics of the day:
+ LAN Design
+Switch Administration
Blue print topics:
1.1.a i Managing MAC address table
1.1.c VLAN technologies
1.1.c i Access ports
1.1.d ii Layer 2, Layer 3
Videos:
Orhan Ergun’s Self Paced Layer 2 Network Design;
Cisco LAN Switching Video
+>Lab 1: Configuring Interfaces
+> Lab 2: Setting UP VLANs
yep, I know… I know… Solution Architect is outside of CCIE blueprint (so in fact, I think it is NOT true!!) but we have a nice opportunity to study Design (Do you disagree??). About that I’ve watched Orhan Ergun’s Self Paced Layer 2 Network Design (4+Hours Design L2 content).
I learned VTP, STP, FHRP, L2 & L3 interaction and L2 & L3 Access Designs. Actually, just some highlights about these technologies, with its pros and cons without any configurations.
…waiting my certificate of course conclusion:,) …
mindset:
- VTP is horrible for network administrators in real life;
- STP great control plane protocol for legacy networks, but environments with critical mission “must” use another solutions like ACI, for example.
One great article about ACI wrote by my friend and coworker Gabriel is available here:
LAN ETHERNET DESIGN
Looped and Loop free topology
Because ethernet frame has no TTL or native loop prevention against L2 loops, is necessary to use STP to block redundant links. That’s it, use STP or Deploy a L3 access design.
another point is about high availability on switches network. Just plugging news cables doesn’t resolve our problem (why??):
. L3 access design
→ Is necessary configure IP subnet between access switches and distribuition/core switches;
→Make a routing protocol adj between switches;
→Yes, I can’t spread your vlans between access switches;
→ Switch with Routing protocols support (more expensive HW).
.L2 access design
→ More then one path is equal STP blocking redundant paths;
→ Default or wrong configuration is equal to a suboptimal path.
STACKWISE vs. VSS vs. vPC
StackWise can have more than 2 member
→ Stack Limit depends on Platform
VSS and vPC are always a pair of switches
SPF, SPF+, QSFP/QSFP+
Yep, another off topic again. But I spent a short amount of time on Optic Fiber Transceivers. Today, I have 6x Cisco Nexus 9000 working in vPC on a Data Center using full mesh topology with QSFP+ transceivers but I don’t fully understand the cable/transceivers caracteristics.
- SPF vs SPF+
Small Form-Factor pluggable is used for both fiber optic or copper. SPF can be seen as the successors of the GBIC. Your compact format and hot-plaggable support is anothers great benefits. If I’m not wrong, it supports max 1Gbit/s conection. About SPF+, is an enhanced version of SPF and support data rates Up to 10 Gbit/s.
- QSFP vs QSFP+
QSFP support 4-channel small form-factor Pluggable. It’s compact, hot-puggable and QSFP+ standard to support 10Gb/s data rates. About that QSFP+ support uplink with 40Gb/s.
Last topic is — What differ Hubs and Switches
I read a simple review about how a switch learns and manage MAC address, basides some virtual LAN conpects.
Just remmenber, Hubs works only on the P H Y S I C A L Layer.
THAAAAAAAAAAAAAAAAAAAAAAnnNNNn!!
N e w s! I’ll start using INE.com plataform toooo
What’s next ?
