NEW SWITCH DEPLOYMENT, BASIC ACCESSORIES, NEVER FORGET!!

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INTERCONNECTION TYPES:

SP terms:

EQUINIX ECX

Guidelines:


For inbound filtering (maintained by BOGON project):

IPV6 NOTES , IPV6 BEST PRACTICES:

https://blogs.infoblox.com/ipv6-coe/a-48-for-every-site-and-for-every-site-a-48/

ICANN/IANA recommendations (we have /32):

https://ignition.packetpushers.net/courses/virtual-design-clinic-4-presentations/lessons/ipv6-address-planning-survival-guide-tom-coffeen/

dhcpv6_vs_slaac:

SLAAC+dynamic DNS registration vs RA+DHCPv6

@ This seems a bit convoluted but this decoupling of default route from the dhcpv6 allows resiliency from any possible failure of the dhcp server
@@ Also the next hop you see in the rt (given by the RA) is the link local address!. There is not dhcpv6 support in Android ;
FLAGS

sdjo


£ Global Unicast Allocation (GUA, /64) sent via a RA; node combines this prefix with its interface identifier resulting in the GUA address (eg: 2001:db8:66:6:536:e8ff:febb:14cb)


ABOVE https://blogs.infoblox.com/ipv6-coe/slaac-to-basics-part-2-of-2-configuring-slaac/
For linux: https://www.tldp.org/HOWTO/html_single/Linux+IPv6-HOWTO/

Sample configurations: large_ipv6_access_networks.pdf

FEC0:1:2300:1::1/64

BRANCH BUYING TRANSIT SERVICES:
What to ask:


DC
BUYING TRANSIT SERVICES. What to ask:

DATACENTER EQUIPMENT
PDU:

CONNECTOR TYPES, CHECK THIS LINK FIRST: https://www.showmecables.com/blog/post/power-cables

PDU TYPES:


USB TYPES:

Datacenter powering concepts
The datacenters sell you, for instance 4.99 kVA. but it should be used in a primary and redundant fashion. That's per feed, so you can potentially load the rack up to x2 4.99 kVA. The problem is that, if one feed is disconnected, the other will not be able to absorb all the power and will trip out!

Good numbers per rack is:

dc 2 vs three phase disquisition:


Use case:

The above is Wye (the other one is Delta configuration, more used for motors and equipment requiring more initial torque)

OPTIC TECHNOLOGIES
https://community.fs.com/blog/name-brands-vs-third-party-transceivers-which-do-you-prefer.html ; https://tmgmatrix.cisco.com
SFP , SFP+(1G or 10G) , SPF28, QSFP , QSFP28, QSFP-DD


DR vs FR: difference is the distance they support. FR is 2km while DR is 500m. Different in the transmitter power and the receiver sensitivity
For single mode, nowadays tends to be OS2 UPC
Modulation:


Silicon photonics: We 'couple' light into silicon (concept of impedance in silicon fotonics) so we can guide compine split modulate it

PHYSICAL LABEL JUNOS HARDWARE CLI:
Use this for juniper hardware: https://apps.juniper.net/hct/home/


100Gb/s (4 lanes so QSFP28 )

400GBPS:

Manufacturers

CAT5e-6

DWDM

OADM (add drop multiplexer): An OADM generally consists of three parts: an optical demultiplexer, an optical multiplexer, a method of reconfiguring the paths between the optical demultiplexer and the optical multiplexer, as well as a set of ports for adding and dropping signals. The multiplexer is used to couple two or more wavelengths into the same fiber.


Branding


Setups:

ISPs are confirmed to be on-net

EQUIPMENT AMORTIZATION DEPRECIATION FORMULA:
For servers: 3 year depreciation
Example if 20 months: (36-20)/36 = 44% of what they cost

MESSAGE BUS

SUBMARINE CABLES:
https://www.submarinecablemap.com/#/submarine-cable/apollo

CDN NOTES:
Eg: Akamai

SP NAMING:

LOCATION ACRONYMS:

UK DATACENTERS:

CARRIER ETHERNET NOTES
It is mostly a marketing term to define what happens between the Carrier and User.

ROUTE SERVER NOTES
route server
Is a special type of BGP participant, it MUST:

It is also common to demand from a route server that it does not modify some BGP attributes (next-hop, as-path and MED) that are usually modified by standard BGP speakers before announcing a route.
Implementations:

DPU Data Processing Unit (IPU if intel)
All governed from the nic as this is really the part that never goes.
DPU is small computer with pcibus and fast memory. Accelerator to do things like crypto or nvme access.

BUSINESS SOFTWARE / SERVICES

COPPER ETHERNET CABLE TYPES
https://www.comparitech.com/net-admin/difference-between-straight-through-crossover-rollover-cables/

SERIAL ADAPTERS (DB9 (female) to RJ45

https://www.decisivetactics.com/support/view?article=crossover-or-null-modem-vs-straight-through-serial-cable
The PowerEdge R740 system supports one serial connector on the back panel:

For more info : https://www.staub.ca/search?q=DB9

ISP customer/access layer

LATENCY / THROUGHPUT

LTE DONGLE

https://openwrt.org/docs/guide-user/network/wan/wwan/ltedongle

When connected to the rpi: 

You won’t find a TTY device because the dongle is in cdc_ether (network) mode.
Check ip link show for a usb0-style interface.
If you actually want a serial modem for AT commands, you have to unbind cdc_ether and bind the option driver so /dev/ttyUSB* appears.
If your connection is already “100% working” in network mode, you can just treat it like an Ethernet device—no TTY required.

root@rpi4:/dev# usb-devices | awk '/12d1/' RS=
  T:  Bus=01 Lev=02 Prnt=03 Port=02 Cnt=01 Dev#=  5 Spd=480 MxCh= 0
  D:  Ver= 2.00 Cls=02(commc) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
  P:  Vendor=12d1 ProdID=1591 Rev=01.02
  S:  Manufacturer=HUAWEI_MOBILE
  S:  Product=HUAWEI_MOBILE
  C:  #Ifs= 2 Cfg#= 1 Atr=80 MxPwr=2mA
  I:  If#= 0 Alt= 0 #EPs= 1 Cls=02(commc) Sub=06 Prot=00 Driver=cdc_ether <<<
  E:  Ad=83(I) Atr=03(Int.) MxPS=  16 Ivl=2ms
  I:  If#= 1 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=cdc_ether <<<
  E:  Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
  E:  Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms

Sometimes they don't need to be QMI or MBIMQMI or MBIM devices typically create a /dev/cdc-wdm# interface and use specialized drivers (qmi_wwan or cdc_mbim), along with user-space tools like qmicli or mbimcli. CDC-Ether (NCM) devices show up simply as a USB-Ethernet interface

STACKWISE CABLES

1)
QMA is Qualcomm proprietary; others: NCM, ECM, RNDIS