MPLS a QoS – praktycznie.pdf

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klstanie_plnog7_v0.2
Klaudiusz Staniek
Network Consulting Engineer
Kraków 2011-09-29
© 2011 Cisco and/or its affiliates. All rights reserved.
Cisco Confidential
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•   Service Level Agreement (SLA)
•   QoS Implementation – Case Study
Definition of Core QoS Classes
Core QoS Implementation
CRS-1 Core QoS
XR12K Core QoS
7600 Core QoS (ES20 + LAN Cards)
•   QoS for Local Originated Packets (LOPs)
•   QoS for MPLS/VPN – Deployment Models
•   7600/ES+ on the MPLS Edge
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© 2011 Cisco and/or its affiliates. All rights reserved.
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•   Network Delay
•   Delay variation or delay-jitter
•   Packet lost
•   Throughput
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•   Measured as:
on-way delay [RFC2679]
round-trip delay/time (RTT) [RFC2681]
•   Propagation Delay
Depends on the speed of light in the transmission medium (i.e. 5ms per
1000km for optical fiber) and distance
The distance can be measured “as the crow flies” geographical distance “D”
between two endpoints.
The route length “R” can be estimated from “D”, for example, using the
calculation form ITU recommendation [G.826]:
D < 1000km
R=1.5 * D
1000 km ≤ D ≤ 1200 km
R=1500 km
D > 1200 km
R=1.25 * D
© 2011 Cisco and/or its affiliates. All rights reserved.
Cisco Confidential
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