Celebrated the New Years with some Sweet Soca Music. I love colors and decorated up a dress because I could not find a colorful dress in the store, I kind of get last minute with things and would normally order online. Crunch time… two nights before created my dress. Family emergency and then went to work, then partied hard in my personalized, one of a kind dress.
I have received some tough, tough news. I passed ROUTE! Crunch time. Passed Route, have to Pass Switch ASAP in order to get something out of the fact that I passed route. I never wanted success in an educational endeavor as bad as this crunch time. I have some stories about a Full Sail Math Entry Exam for Game Development Degree. I could tell you about later too.
Funny thing, I did not believe i was going to pass when I went in. I was also wearing the same dress I wore when I passed my CCNA.
Big hint for labs.
copy [tab] run [tab] start [tab]
metric 1 1 1 1
subnets
Congratulations to me! Yay, I passed. Same say, must begin studying Switch. No breaks allowed.
On my way, I picked up these:
And Before that I picked up this:
I was working on JNCIA, I love Juniper, but I need to stay focused on my goal. I need to get my Cisco Tiara.
Cisco Certified Networking Princess.
and then
Cisco Certified Networking Empress
Okay I need to stop playing around and here is my study journey for switch so far!
Now I will drop my study notes for switch…… It is a mess but it’s literally copy paste of my notes.
Begins:
When you change the default Template you must reload. Switch will tell you so make sure you do it or you will see desktop or what was previously there.
sdm prefer vlan
then have to reload
if you do show sdm prefer it will be with the old one
Must reload
Leave auto-negotiation alone.
FLP
Fast Link Pulses
DTP should be disabled for security reasons.
Unconditional trunking mode and then turn dtp off
ports in auto encap mode can’t be configured to trunk mode, show int trunk port negotiate, if make trunk port, unconditional trunk port, gotta make it negotiate.
do not debug ip packet if on busy network
voice,
you do not want jitter.
can be 802.111q or access
portfast automatically enabled
vtp modes
server mode – create delete modify
client – can not configure vtp vlan in client mode
transparent – not participating in vtp domain, not sync vtp database and do not advertise their own, locally significant
off – antimode, disabling vtp on switch.
Configuration revision number, latest revision and not rewriting from older
Ignores older revision.
Can’t just reboot, if you going to do it, set to zero if you add a new one to it.
VTP Pruning
Trunk ports are members of all our vlans
broadcast, multicasts, and unknown unicasts
overhead on each
STP
identify loop free path, chose best path for use block ports for less desired unblock necessary for next best
first thing switch look at on frame, source mac address
how it builds mac address table.
Ports
root port in forwarding
alternate in blocking
you will know you are on root
Path Cost
Physical shortest path is not always logically the shortest path. Look at Links
Load Balancing Per VLAN basis
cost command is all or nothing
change cost for some vlans and leave alone for others?
Modes:
Blocking, Listening, Learning, Disabled, Forwarding
Uplink fast only on access level switches
backbone fast helps network recover from indirect linkfast
Reviewing STP again because it made me nervous.
Portfast allows a port running STP to go directly from blocking mode to forwarding mode.
spanning portfast or spanning portfast disable
Portfast should only be enabled to ports connected to a single host.
Uplinkfast– port goes through blocking to forwarding transition without delay
Uplinkfast only on access layer switches.
spanning uplinkfast
backbonefast – cisco proprietary, used for network to recover indirect link failures, skips max age stage which cuts the delay
root guard – configured at port level and disqualifies any switch downstream from port becoming primary or secondary root
BPDU Guard – takes rootguard 1 step forward. when any bpdu comes in, error disabled state. shut port down
UDLD – BPDU may not arrive at their destination because of a unidirectional link where sw1 can send to sw2 but can’t send bpdu back over the same conenciton. UDLD enabled port sends a frame across the link every 15 seconds by default.
RSTP – rapid spanning tree protocol. an extension of 802.1d defined by ieee 802.1w
alt – alerternate port, on shared segment.
difference between stp and rstp port states
STP
– disabled
– blocking
– listening
– learning
– forwarding
RSTP
– discarding
– learning
– forwarding
Edge Ports and Point to Point Port
STP – Half Duplex are shared ports
RSTP Edge port – spanning tree port fast
BPDU on edge port demoted to regular RSTP port
spanning-tree mode rapid-pvst
p2p is point ot point
p2p peer stp is running regular stp
PVST+ – per vlan spanning tree version (cisco proprietary) not extra work for cpu
requires isl trunking
dot1q is trunking protocol using a common interface of STP for all vlans. MST allows us to reduce the number of STP instances without knocking it all the way back to 1
MST was designed for enterprise networks. map multiple vlans to lesser number of stp instances.
logically deciding switches into region. agree on mst config name, revision number, vlan mapping table
cst covers entire network, mst is subset of network. ist instance that is responsible for keeping everything inside loop free
must be in mst config mode to see “show pending”
Etherchannel – logical bundling of two to eight parallel links running between two switches. aggregation. use more of our available bandwidth and avoid 50-second delay that max age and forward delay timers
STP considers etherchannel to be a single link regardless of how many physical links there are.
