ONT Notes – Pre-classify and End-to-end QoS

February 3, 2010 By jac 2

VPNs (Didn’t ISCW cover this?)
- Provide
  - Confidentiality
  - Integrity
  - Authentication
- Types
  - Remote-access
    - Client-initiated
    - NAS-initiated
  - Site-to-site
    - LAN-to-LAN
    - Extranet
L3 Tunneling protocols
- GRE
- IPSec
Pre-classify allows traffic to be classified before being sent across a tunnel or crypto-ed.
- qos pre-classify
- Provides a view into the original IP headers
- To classify on pre-tunnel header, apply the policy to the tunnel interface WITHOUT pre-classify.
- To classify on post-tunnel header, apply the policy to the physical interface WITHOUT pre-classify.
- To classify on pre-tunnel header, apply the policy to the physical interface WITH pre-classify.
SLA – agreement with provider to guarantee QoS mechanisms across their network based on your markings.
- Assures availability, loss, throughput, delay, and jitter.
End-to-end QoS
- To be effective, each hop in the path must have QoS configured similarly.
- Necessary in three locations
  - Campus – within the customer network
  - The edges – customer facing the provider, provider facing customer
  - On the provider network
QoS tasks
- Campus access switches
  - Speed/duplex settings
  - Classification
  - Trust
  - Phone/access switch configs
  - Multiple queues on switch ports, including priority for VOIP
- Campus distribution
  - L3 policing and marking
  - Multiple queues on switch ports, including priority for VOIP
  - WRED
- WAN edge
  - SLA definitions
  - LLQ
  - LFI
  - WRED
  - Shaping
- Provider cloud
  - Capacity planning
  - PHB
  - LLQ
  - WRED
Enterprise campus QoS implementation
- Implement multiple queues to avoid congestion
- Assign VOIP and video to highest priority queue
- Esablish trust boundaries
- Use policing to rate-limit excess traffic
- Use hardware QoS when possible
Control Plane Policing (CoPP)
- Applies QoS policy to traffic destined for the router
  - Routing protocols
  - Management protocols
- Can be used to avoid DOS attacks
- Applied to control-plane in global config

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jac

Aaron does lots of stuff and, therefore, does nothing well. He's trying, though.

https://masto.ai/@aconaway

About The Author

jac

Aaron does lots of stuff and, therefore, does nothing well. He's trying, though. https://masto.ai/@aconaway

2 thoughts on “ONT Notes – Pre-classify and End-to-end QoS”

Rofi Neron says:

February 4, 2010 at 12:37 pm

love the new site theme and can’t wait for my ONT studies, you are doing a great job and I’m sure gonna use it!

Rofi

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Aaron Conaway says:

February 4, 2010 at 9:27 pm

Thanks, Rofi. Be sure to get your ONT done by July 31st to get credit for it towards your CCNP!

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ONT Notes – Pre-classify and End-to-end QoS

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2 thoughts on “ONT Notes – Pre-classify and End-to-end QoS”

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