Cisco Cisco ASR 5700 トラブルシューティングガイド
Contents
Introduction
Explanation via Examples
Count dedicated and default bearers for a VoLTE subscriber
Count dedicated and default bearers which share the same callid
Mix of qualifiers that apply to dedicated/default bearers versus all subscribers
Introduction
This document describes what appears to be an inconsistency in subscriber counts reported with
the "show sub summary" command. Normally the count of all the subscriber types from "show sub
summary" add up to the "Total Subscribers" count at the top. However, the existence of both
dedicated and default bearers for subscribers and use of certain qualifiers can result in the counts
of various subscriber types that do not match what is expected for the "Total Subscribers".
the "show sub summary" command. Normally the count of all the subscriber types from "show sub
summary" add up to the "Total Subscribers" count at the top. However, the existence of both
dedicated and default bearers for subscribers and use of certain qualifiers can result in the counts
of various subscriber types that do not match what is expected for the "Total Subscribers".
Explanation via Examples
Count dedicated and default bearers for a VoLTE subscriber
In the case of Voice over Long Term Evolution (VoLTE), there is a dedicated and default bearer
for the IP Multimedia System (IMS) Application Point Name (APN) that is essential for the setup of
all VoLTE calls. "Show sub summ" increments by one for the "Total Subscribers" field for each
unique subscriber, even though each subscriber has two bearers. But, the fact that each
subscriber has two bearers IS captured in the subsections of the CLI. For example, note here that
the count of pgw-gtp-ipv6 represents the count of both the dedicated and default bearers for the
IMS APN, while the Total count only captures the fact that both of the bearers are for the same
IMS APN. This is further confirmed by the pgw-only qualifier which actually lists out the individual
bearers, but like the non pgw-only version, only counts a subscriber once per APN via the Total
field.
for the IP Multimedia System (IMS) Application Point Name (APN) that is essential for the setup of
all VoLTE calls. "Show sub summ" increments by one for the "Total Subscribers" field for each
unique subscriber, even though each subscriber has two bearers. But, the fact that each
subscriber has two bearers IS captured in the subsections of the CLI. For example, note here that
the count of pgw-gtp-ipv6 represents the count of both the dedicated and default bearers for the
IMS APN, while the Total count only captures the fact that both of the bearers are for the same
IMS APN. This is further confirmed by the pgw-only qualifier which actually lists out the individual
bearers, but like the non pgw-only version, only counts a subscriber once per APN via the Total
field.
These examples are taken from a Packet Data Network Gateway (PGW) that includes both LTE
and Enhanced High Rate Packet Data (eHRPD) call types.
and Enhanced High Rate Packet Data (eHRPD) call types.
Note that pgw-gtp-ipv6 (LTE) + pgw-pmip-ipv6 (eHRPD) - Total Dedicated Bearers = Total Subs
This principal even applies to "show sub" summ without any qualifiers.
65 + 1567327 + 285074 + 235124 + 1653 = 3430145 - 547 (dedicated bearers) = 3429598 ~=
3429614
3429614
This is even clearer when you qualify by just VoLTE subscribers that pass voice data using QCI =
1 via the dedicated bearer. In this case note that the pgw-gtp-ipv6 is roughly double the Total
Subscribers, since it counts both the dedicated and default bearers for each VOLTE subscriber.
1 via the dedicated bearer. In this case note that the pgw-gtp-ipv6 is roughly double the Total
Subscribers, since it counts both the dedicated and default bearers for each VOLTE subscriber.
Count dedicated and default bearers which share the same callid