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Poor Video Quality and Pixelization On IPTV Stream Running Over 10 GbE Port With 1 GbE SFP Installed

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Information

 
TitlePoor Video Quality and Pixelization On IPTV Stream Running Over 10 GbE Port With 1 GbE SFP Installed
Symptoms
  • Pixelization and poor video quality with IPTV streams on 10 GbE ports
  • Video quality may worsen as additional streams and/or devices using multicast are added to same switch or stack
  • Issue present when 1 GbE SFP installed in 10 GbE port
  • Issue not present when 10 GbE ports have 10 GbE SFP installed
  • Issue not present on ERS 4800 or legacy ERS 4500 and 5500 switches
Environment
  • ERS 4900
  • ERS 5900
  • All supported releases
Cause
  • Product is functioning as designed
  • Default setting on switch applies 10% rate limit on all 10 GbE ports
  • Rate limit percentage applied to 10 GbE ports regardless of port speed (1 Gbps or 10 Gbps)
5952GTS(config-if)#show rate-limit port 50
Port  Packet Type  Limit          Last 5 Minutes  Last Hour  Last 24 Hours
----  -----------  -------------  --------------  ---------  -------------
50    Both         10%                0.0%         0.0%         0.0%

 
Resolution
Workaround
Disable rate-limit on uplinks receiving IPTV traffic:
  1. Type enable
  2. Type config term
  3. Type interface ethernet <PORT_#>
  4. Type no rate-limit port <PORT_#>
5952GTS(config-if)#show rate-limit port 50
Port  Packet Type  Limit          Last 5 Minutes  Last Hour  Last 24 Hours
----  -----------  -------------  --------------  ---------  -------------
50    Both         None               0.0%         0.0%         0.0%
Additional notes
  • In ERS 4900/5900 release 7.7.0 the default rate-limit value for fiber 10 GbE ports when operating at 1 Gbps will be 0%
  • New default value of 0% applied when 1 GbE SFP inserted and port had rate-limit set at 10 GbE default value of 10% rate-limit
  • In 7.7.0 release, if the port operates at 10 Gbps nothing is changed (the default value applied is still 10%)

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