Cisco Unified Contact Center Enterprise Solution Reference ...

Chapter 11 Bandwidth Provisioning and QoS Considerations
Table 11-5 Example Calculation for a Combined Dedicated Private Link
Component Effective BHCA
Router +
Logger
Cisco Unified
CallManager
PG
Unified IP IVR
PG
Unified CVP
PG
Unified IP IVR
or
Unified CVP
Variables
OL-8669-05
Multiplication
Factor
Recommended
Link
Multiplication
Factor
For the combined dedicated link in this example, the results are as follows:
Total Link = 2,550,000 bps
Router/Logger high-priority bandwidth queue of 297,000 bps
Recommended
Queue
Cisco Unified Contact Center Enterprise 7.x SRND
Bandwidth Provisioning
11,000 ∗ 30 330,000 ∗ 0.8 297,000 Total
Router+Logger
High-Priority
Queue Size
11,000 ∗ 100 1,100,000 ∗ 0.9 880,000 Add these three
numbers
together and
14,000 ∗ 60 840,000 ∗ 0.9 756,000
0 ∗ 120 0 ∗ 0.9 0
14,000 ∗ ((Number of
Variables ∗ Average
Variable Length) /
40)
280,000 ∗ 0.9 252,000
PG high-priority bandwidth queue of 1,888,000 bps
If this example were implemented with two separate links, Router/Logger private and PG private, the
link sizes and queues would be as follows:
Router/Logger link of 330,000 bps (actual minimum link is 1.5 Mb, as defined earlier), with
high-priority bandwidth queue of 297,000 bps
PG link of 2,220,000 bps, with high-priority bandwidth queue of 1,888,000 bps
Bandwidth Requirements for Unified CCE Clustering Over the WAN
total in the
shaded box
below to get
the PG
High-Priority
Queue size.
Total Link Size 2,550,000 1,888,000 Total PG
High-Priority
Queue Size
For details about Unified CCE clustering over the WAN, see IPT: Clustering Over the WAN, page 2-27.
Bandwidth must be guaranteed across the highly available (HA) WAN for all Unified ICM private,
public, CTI, and Cisco Unified CallManager intra-cluster communications (ICC). Moreover, bandwidth
must be guaranteed for any calls going across the highly available WAN. Minimum total bandwidth
required across the highly available WAN for all Unified CCE signaling is 2 Mbps.
In addition to the bandwidth requirements for the private and public networks, this section adds
bandwidth analysis for the connections from Unified IP IVR (CRS) or Unified CVP PG to
Unified IP IVR (CRS) or Unified CVP, CTI Server to CTI OS, and Cisco Unified CallManager
intra-cluster communications (ICC).
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