common: gb-ns2: add chapter Gb/NS maintenance
Add chapter to describe common maintenance Change-Id: I5571001a127c933397a4bc26e85410288d50fc2f
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=== Gb/NS maintenance
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This section describes common maintenance procedures.
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[[ns2-nse-states]]
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==== NSE states
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A NSE can have the following states:
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.NSE states
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* ALIVE
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* DEAD
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For FR, IPA: The NSE is ALIVE if there is at least one NSVC in state UNBLOCKED.
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For IP-SNS/UDP: The NSE is ALIVE if there is at least one NSVC ALIVE and the sum of all ALIVE NSVCs signalling weights > 0 and data weights > 0.
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The state of the NSE is shown by vty.
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.show ns
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----
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GbProxy# show ns nsei 1234
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NSEI 01234: UDP, DEAD <1>
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FSM Instance Name: 'GPRS-NS2-SNS-BSS(NSE01234-SNS)[0x6120000012a0]', ID: 'NSE01234-SNS'
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Log-Level: 'DEBUG', State: 'BSS_SIZE'
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Timer: 1
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Maximum number of remote NS-VCs: 8192, IPv4 Endpoints: 8192, IPv6 Endpoints: 8192
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1 NS-VC:
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NSVCI none: DISABLED DYNAMIC data_weight=1 sig_weight=1 udp)[127.0.0.1]:23000<>[127.0.0.1]:22000
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----
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<1> NSE state
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==== NSVC states
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A NSVC can have the following states:
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.nsvc states
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[options="header"]
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|=========================================================
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| State | transport UNITDATA | Description
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| DISABLED | No | Either the transport layer is unavailable (FR) or this NSVC is currently used by IP-SNS dynamic configuration.
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| RESET | No | Sending out RESET PDU and awaiting data.
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| BLOCKED | No* | The NSVC has been BLOCKED. * see 3GPP TS 48.016 § 7.2 exception
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| UNBLOCKED/ALIVE | Yes | The NSVC transport UNITDATA.
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| RECOVERING | No | The NSVC test procedure timed out. NSVC type is a IP-SNS which don't use RESET/BLOCK/UNBLOCK.
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|=========================================================
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[[fig-nsvc-states-reset-block]]
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.Simplified state diagram for RESET BLOCK UNBLOCK NSVCs
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[graphviz]
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----
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include::gb-ns2-nsvc-states-reset-block.dot[]
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----
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[[fig-nsvc-states-alive]]
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.Simplified state diagram for IP-SNS/UDP
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[graphviz]
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----
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include::gb-ns2-nsvc-states-alive.dot[]
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----
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==== Show information of a specific NSE
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The NSE 1234 has been configured for as BSS with IP-SNS configuration.
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.show ns on a dynamic configured IP-SNS NSE
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----
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GbProxy# show ns nsei 1234
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NSEI 01234: UDP, DEAD <1>
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FSM Instance Name: 'GPRS-NS2-SNS-BSS(NSE01234-SNS)[0x6120000012a0]', ID: 'NSE01234-SNS'
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Log-Level: 'DEBUG', State: 'BSS_SIZE' <2>
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Timer: 1
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Maximum number of remote NS-VCs: 8192, IPv4 Endpoints: 8192, IPv6 Endpoints: 8192
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1 NS-VC:
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NSVCI none: DISABLED DYNAMIC data_weight=1 sig_weight=1 udp)[127.0.0.1]:23000<>[127.0.0.1]:22000
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----
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<1> A UDP NSE. A NSE can be ALIVE or DEAD
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<2> The SNS state. CONFIGURED and LOCAL_PROCEDURE are ALIVE states
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For description of NSE states see <<ns2-nse-states>>.
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.show ns on a frame relay NSE
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----
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OsmoNSdummy# show ns nsei 02001
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NSEI 02001: FR, ALIVE <1>
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4 NS-VC:
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NSVCI 00001: DISABLED PERSIST data_weight=1 sig_weight=1 fr)netif: hdlcnet1 dlci: 16 <2>
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NSVCI 00002: DISABLED PERSIST data_weight=1 sig_weight=1 fr)netif: hdlcnet2 dlci: 17 <3>
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NSVCI 00003: DISABLED PERSIST <4> data_weight=1 sig_weight=1 fr)netif: hdlcnet3 dlci: 18
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NSVCI 00004: DISABLED PERSIST data_weight=1 sig_weight=1 fr)netif: hdlcnet4 dlci: 19
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----
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<1> A FR NSE. A NSE can be ALIVE or DEAD
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<2> An unblocked NS-VC will be used for data and signalling. data and signalling weight are only relevant for UDP NSVC.
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<3> NSVC is still blocked.
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<4> A PERSIST NSVC is a configured via VTY.
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==== Blocking a NSVC
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.how to block a single NSVC
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----
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OsmoNSdummy# show ns nsei 01234
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NSEI 01234: UDP, ALIVE since 0d 0h 41m 6s
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2 NS-VC:
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NSVCI 01234: UNBLOCKED PERSIST udp)[127.0.0.1]:23000\<1234>[127.0.0.1]:22000 ALIVE since 0d 0h 2m 36s
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NSVCI 01235: UNBLOCKED PERSIST udp)[127.0.0.1]:23001\<1235>[127.0.0.1]:22001 ALIVE since 0d 0h 41m 6s
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OsmoNSdummy# nsvc 1234 block
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The NS-VC 01234 will be blocked.
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OsmoNSdummy# show ns nsei 01234
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NSEI 01234: UDP, ALIVE since 0d 0h 42m 7s
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2 NS-VC:
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NSVCI 01234: BLOCKED PERSIST udp)[127.0.0.1]:23000\<1234>[127.0.0.1]:22000 DEAD since 0d 0h 3m 37s
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NSVCI 01235: UNBLOCKED PERSIST udp)[127.0.0.1]:23001\<1235>[127.0.0.1]:22001 ALIVE since 0d 0h 42m 7s
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----
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@ -0,0 +1,6 @@
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digraph G {
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DISABLED -> ALIVE;
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ALIVE -> RECOVERING [label="test procedure timeout"];
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RECOVERING -> ALIVE [label="test procedure success"];
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}
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digraph G {
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DISABLED -> RESET [label="transport layer available"];
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RESET -> BLOCKED [label="reset ack"];
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BLOCKED -> UNBLOCKED [label="unblock"];
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UNBLOCKED -> BLOCKED [label="block"];
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BLOCKED -> RESET [label="test procedure timeout"];
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UNBLOCKED -> RESET [label="test procedure timeout"];
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}
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