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For Prioritizing SSH, Telnet, TACACS locally generated traffic on Cisco ASR running IOS XR, we have:

ssh server dscp 48
tacacs-server ipv4 dscp 48

Need the same for cisco GSR: 12416/PRP running IOS. Maybe we can use ip ssh precedence? If yes, how exactly?

  • There really is no reason to prioritize telnet. SSH and TACACS+ should probably set to the control class with a low-drop probability (something like af31). – Ron Maupin Sep 17 '19 at 12:12
  • I know the rannge for dscp is <0 to 63> and for af31, having 26 should do. But unable to get to do it using "tacacs-server ipv4 dscp" command on GSR 12000 series – Blake Sep 17 '19 at 12:28
  • I'm not completely sure about that router, but you normally would use ACLs and class maps to classify traffic and a policy map to assign the DSCP values, and you can actually use the AF values, e.g. set dscp af31. – Ron Maupin Sep 17 '19 at 12:35
  • on IOS you can use ip ssh dscp 48 for SSH connections. Dont know of any command that does the same for tacacs though... – Mario Jost Sep 17 '19 at 14:28

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