User's Manual

Chapter 3 - Operation and Administration Using the CLI NPU Configuration
4Motion 340 System Manual
keep-alive response, the ASN-GW shall make further actions, such as clearing the
applicable MS(s) context.
The ASN-GW builds a list of BS-of-interest which it must poll. The list shall be
dynamically updated; the ASN-GW tracks all BSID(s) in all MS(s) contexts it holds,
and dynamically updates the list of BSs-of-interest. When a new MS is attached to
a BS that does not exist in the list, it will be added it to the list. When the last
MS(s) with specific BSID makes network exit, the ASN-GW shall remove the BS
from the list.
The ASN-GW periodically polls the BS(s) for keep-alive. The polling mechanism is
independent and unrelated for every BS-of-interestthe ASN-GW polls.
The keep-alive mechanism uses configurable retry timer and retries counter.
Upon expiration of the retry timer, the ASN-GW resends the ASN Keep-Alive
request message. Upon expiration of the retries counter, the ASN-GW assumes
failure of the polled BS and clears the contexts of all MS(s) served by that BS.
In addition, the ASN-GW verifies that for each polled entity that the
“Last-Reset-Time” UTC value of poll N+1 is equal to the value of poll N. If the
“Last-Reset-Time” UTC value of poll N+1 is higher than the value of poll N, this
mean that the BS went through reset state during the interval between two
consecutive polls. In this case, the ASN-GW shall clear all MS(s) contexts, served
by that specific BS that are “older” than BS life after reset (through calculation of
difference between polled entity “Last-Reset-Time” received on poll N+1 and MS
network entry time stamp on ASNGW).
If the ASN-GW is the authenticator for the MS(s) the failing BS served, then in
addition to context clearance it also sends R3 Accounting-Request (Stop) message
including a release indication to AAA.
When keep-alive fails, ASN-GW generates an event.
Regardless of the enable/disable status of the keep-alive mechanism in the
ASN-GW, it replies to ASN_Keep_Alive_Req received from other BSs with
ASN_Keep_Alive_Rsp. that includes also its “Last-Reset-Time”. It responds only if
all its functions operate properly. In case one of the functions fails, the ASN-GW
shall not respond to the keep-alive poll.
3.3.11.17.1 Configuring ASN-GW Keep-Alive Parameters
To configure one or several keep-alive parameters, run the following command:
npu(config)# keep-alive ([asn-ka <enable|disable>] [period <integer (10-1000)>]
[rtx-cnt <integer (1-10)>] [rtx-time <integer (5000-10000)>] )