05-18-2020 01:06 AM
Hello there,
I am planning to build a two node cluster for each exp-C and exp-E.
My questions are as follows:
1) If single CE 1200 (C&E Pair) supports 5000 registrations and 1000 concurrent audio calls will a Cluster of two simply multiply the cluster capacity by 2 ? or Does during building a cluster there is an option to either chose Active/Passive ?
2) Do I need any extra licenses for CE1200 cluster. I will be using expressways for MRA only and users will make only registered calls and PSTN calls. All I have done is ordered 4 x EXPWY-1200-K9.
05-18-2020 07:24 AM
Have you read Cisco Expressway Cluster Creation and Maintenance doc?
05-18-2020 07:28 AM
:) yes i still have these question, Can you help ?
05-18-2020 09:21 AM - edited 05-18-2020 09:22 AM
Hi,
1. The detailed information about cluster capacity is mentioned in below guide:
In short, here are answers to your question:
To determine the capacity for clusters with two or three nodes, apply a factor of 2 or 3 respectively to the standalone figures. So if you are deploying two CE1200, then it will support 10,000 registrations, 1000 Video or 2000 Audio Calls.
2. If you are using Expressway C& E only for MRA then you need following licenses:
PID | Description | Where to Apply |
LIC-SW-EXP-K9 |
Release key for Expressway – This is the main release key for the VM | Both |
LIC-EXP-SERIES |
Enable Expressway Series Feature Set – Turns a VCS Series into an Expressway Series | Both |
LIC-EXP-AN |
Enable Advanced Networking Option – Enable Dual-NIC and Static NAT address |
Exp-E only |
LIC-EXP-E |
Enable Expressway-E Feature Set – Turns an Expressway-Core into an Expressway-Edge |
Exp-E only |
Please refer this document for more details:
05-18-2020 11:47 PM - edited 05-18-2020 11:50 PM
Hello Vaijanath ,
Thanks for the responses.
1) Actually the below table from Cisco for medium OVA shows no Capacity increase for 2 node cluster (not sure why?) this is creating some confusion. However as per your reply it seems its safe to apply the factor of 2 for 2 node cluster.
Virtual machine with medium OVA template | 2,500 | 100 | 200 |
Virtual machine with medium OVA template | |||||
Deployment 1 | 2 nodes | N+1 | 2,500 | 100 | 200 |
Deployment 2 | 3 nodes | N+1 | 5,000 | 200 | 400 |
Deployment 3 | 6 nodes | N+2 | 10,000 | 400 | 800 |
2) For licenses actually I am planning to go with Appliance CE 1200 and while creating BOM it doesn't have any of the below license options which you mentioned.
EXPWY-1200-K9 | - | Cisco Expressway Series Multi-purpose 1200 Appliance |
EXP-CPU-6134 | - | 3.2 GHz 6134/130W 8C/24.75MB Cache/DDR4 2666MHz |
EXP-HD2T7KL12N | - | 2 TB 12G SAS 7.2K RPM LFF HDD |
EXP-TPM2-002 | - | Trusted Platform Module 2.0 for UCS servers |
EXP-MRAID1GB-KIT | - | SAS RAID KIT for C220M5L |
EXP-PSU1-770W | - | 770W AC Hot-Plug Power Supply for 1U C-Series Rack Server |
EXP-SD-32G-S | - | 32GB SD Card for UCS servers |
EXP-BZL-C220M5 | - | C220 M5 Security Bezel |
EXP-10GSFP-SR-MP | - | 10 Gigabit Ethernet SFP Module 10GBASE-SR SFP+ SR Optics |
EXP-PCIE-ID10GF | - | Intel X710-DA2 dual-port 10G SFP+ NIC |
EXP-1GSFP-T | - | 1 Gigabit Ethernet SFP Module 10/100/1000BASE-T |
EXP-MR-X16G1RS-H | - | 16GB DDR4-2666-MHz RDIMM/PC4-21300/single rank/x4/1.2v |
EXP-MSTOR-SD | - | Mini Storage Carrier for SD (holds up to 2) |
R2XX-RAID1 | - | Enable RAID 1 Setting |
LIC-EXP-BASE-K9 | - | License Key Software Encrypted |
SW-EXPWY-12.X-K9 | - | Software Image for Expressway with Encryption, Version X12 |
CAB-9K12A-NA | - | Power Cord, 125VAC 13A NEMA 5-15 Plug, North America |
05-18-2020 09:29 AM
The answer to your sizing question is in that doc, read:
About Capacity Gain
Cluster capacity for MRA registrations
No passive/active, they're all active, this is handled via SRVs and covered in the MRA guide.
05-19-2020 03:21 AM
Anil,
Which part of the document is not clear. I believe it explains clustering and capacity in detail. Can you be more specific?
05-19-2020 03:30 AM - edited 05-19-2020 04:57 AM
hello Ayodeji,
Table 9-9 in the link I shared. It says With a cluster of 2 or 3 nodes, one node can fail without impacting the cluster capacity. My understanding is if one node supports 200 audio calls , 2 nodes will support 400 as both are active / active and if one node fails the cluster capacity is reduced by Half. This statement is true for a 6 node cluster where 2 nodes can fail without impacting the overall cluster capacity. Am i missing anything here ?
Table 9-9 shows the cluster capacity for those recommended deployments. It is important to note that all of the deployment models account for redundancy. With a cluster of 2 or 3 nodes, one node can fail without impacting the cluster capacity (N+1 redundancy).
05-19-2020 06:29 AM
I am going to use this table to explain it.
1. Using a medium size ova, one node support 100 video session and 200 audio sessions
2. A 2 or 3 node cluster supports N+1 cluster capacity..ie
For a 2 node node cluster it will be 100 video session and 200 audio session. This means that if one node fails, this cluster capacity is maintained.
For a 3 node cluster it will be
200 video sessions and 400 audio sessions.
For a full 6 node cluster it will be N+2 capacity so it's
400 video session and 800 audio sessions.
The maths is in the N+1 and N+2
So as you can see if one node fails in the N+1 the cluster capacity is maintained.... You start from cluster capacity and work your way back..the only time cluster capacity is halved or impacted is if you are assuming a N cluster capacity in which case for a 3 node cluster you expect 600 audio calls but when one goes you are left with 400...but that's not the case here..
I hope it's clear
05-19-2020 06:35 AM
hello Ayodeji ,
Thanks for the reply.
Yes, I agree with you. We need to start from cluster capacity and work the way back to decide how may nodes we need to put so that we get redundancy.
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