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Session Maintenance and Optimization

Overview

You can optimize how Junos OS manages and maintains your sessions through the following options:

  • Session Scaling Profiles

  • Session Scale Monitoring

  • Session Summaries and Viewing

  • Clear Sessions

  • Unused Route Removal

  • Peer Group Routing Instances

Session Scaling Profiles

SAEGW allocates memory based on the session scaling profile selected in the configuration. If you do not select a session scale, then Junos OS will select the maximum available scale for your configuration. See Table 1 for the available scaling options on your device. You can configure session scaling with the mobile-edge session-scale statement.

Table 1: Supported Session Scaling Profiles by Platform
Device Supported Session Scales

MX204

  • 50k

  • 100k
MX10003

  • 100k

  • 250k

  • 500k

MX240/480/960/10004/10008

  • 250k

  • 500k

  • 750k

  • 1m

Session Scale Monitoring

When your session scaling hits 80%, 90%, and 100% of the scale profile's capacity, Junos OS sends telemetry and ERRMSG notifications to you. When you hit 100% capacity, Junos OS rejects new sessions.

View Sessions and Session Summaries

You can view session entries from the internal table with the transient-sessions filter. This filter enables you to view all sessions and session IDs that are in a transient state. If a session stays in a transient state for several minutes, you can consider it a potentially stuck session.

You can view session summaries in both 5-minute and and hourly increments with the show services mobile-edge sessions histogram command.

Clear Sessions

You can clear any subsciber session from Junos OS with the session ID. This allows you to remove any subscriber sessions that get stuck in any state. You use the clear services mobile-edge sessions command to clear sessions.

Unused Route Removal

Junos OS deletes exact routes when the last session using that route is deleted. Junos OS will not advertise the deleted routes, and the deleted routes aren't visible to Junos OS users via the show route command.

Peer Group Routing Instances

You must designate a routing instance in Junos OS for each peer group on the same user plane function (UPF). This isolates control traffic between subscriber management functions (SMFs) that terminate on the same UPF.

Related Documentation