S6: Hardware Limitation and Planning

LAB Diagram and Devices BOM

My intention is to build and test the labs presented in MPLS in SDN Era Book:

As shown in the network diagram the BOM consist of:

  • 10 x Junos Logical Systems Devices: 2xH, 2xCE, 2xPE, 2xBR, 1xRR, 1xP
  • 4 x IOS XRv Virtual Routers Devices: 2xPE, 1xRR, 1xP

Note: H/CE/BR devices can be built also using simple instance-type virtual routers as no additional inside virtualization is needed.

  • 6 x Junos Routing Instances instance-type virtual routers: 2xH, 2xCE, 2xBR
  • 4 x Junos Logical Systems Devices: 2xPE, 1xRR, 1xP
  • 4 x IOS XRv Virtual Routers Devices: 2xPE, 1xRR, 1xP

Available Resources and Resource Allocation

The lab will be hosted on a MacBook PRO with the following resources:

Device Memory CPU
MacBook Host 16GB 4 CPU with HT
SWAP Memmory ~2GB N/A

Junos and IOS MIX Maximum Resources

Device Memory CPU Run order
vMX Ubuntu Host 12GB 4 OK
IOS RXv-1 VM 3GB 1 OK
IOS RXv-2 VM 3GB 1 OK
IOS RXv-3 VM 3GB 1 Memmory error
IOS RXv-4 VM 3GB 1 Memmory error

Junos Only Maximum Resources

Device Memory Logical Systems Virtual Routers
vMX Ubuntu Host 12GB max 15 unknown limit
Clone of vMX Ubuntu Host 12GB  N/A Memory Error

Note: When I try to start a second vMX Ubuntu Host I get the following memory error: ” To fix this problem, power off other virtual machines or decrease the memory size of this virtual machine to 7060 MB.

IOS Maximum Resources

Device Memory CPU Run order
IOS XRv-1 VM 3GB 1 OK
IOS XRv-2 VM 3GB 1 OK
IOS XRv-3 VM 3GB 1 OK
IOS XRv-4 VM 3GB 1 OK
IOS XRv-5 VM 3GB 1 OK
IOS XRv-6 VM 3GB 1 Memory error

Note: My MacBook supports maximum 5  OS XRv VMs.

Not Enough Memory Error

I power ON the vMX Ubuntu Host, vMX Virtual Router inside Ubuntu and 2 IOS XRv Virtual Routers. Activity Monitor tool shows me I am at the limit of my resources.

I try to power ON the third IOS XRv VM, namely IOS-XRv-3 and I get “Not Enough Memory” error.

SWAP Files and/or Paging

One idea is to check if I can and how to increase swap files.

I have enough hardware memory for swap files on Macintosh HD:

  • Capacity: 999.25 GB
  • Available: 646.22 GB (4.96 GB purgeable)

The swap files are ~2GB:
I think I have reached my MacBook physical limit.

Interesting articles about MacBook and Sierra performance:

On MacRumors: https://www.macrumors.com/2001/09/10/increase-os-x-performance-swap-partition/

On Medium.com: https://medium.com/@ayltai/need-for-speed-how-to-squeeze-every-last-drop-out-of-macos-sierra-7ac17b680c98

Hardware Limitation Workaround

For my LAB, I will build different versions of the lab where I will place the two IOS XRv Virtual Routers in two different roles. This is how I will test interoperability of the two vendors but also the flexibility of the automation solution.

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