Presentation on theme: "Detect MPLS Data Path Impairment Using MPLS PING draft-dunbar-so-mpls-detect-impair-mplsping01 Linda Dunbar Ning."— Presentation transcript:
Detect MPLS Data Path Impairment Using MPLS PING draft-dunbar-so-mpls-detect-impair-mplsping01 Linda Dunbar Ning So Philippe Niger Yannick Le Goff
Example of MPLS Network for Mobile backhaul Base Station fiber microwave RNC BSC SGW End to end MPLS Path An exampleQPSK16QAM32QAM64QAM128QAM256QAM 56MHz Channel bandwidth 100Mbps200Mbps250Mbps300Mbps250Mbps400Mbps Adaptive Modulation
Why source node needs to know the Impairment along the MPLS path? Step 3- Action: Source node can apply more stringent policy control to reduce the incoming traffic, or switch to other optimal path. microwave End to end MPLS Path Step 1- Event: When source node detects its performance to the destination is not as good as expected End to End PM Step 2 – Trigger: source node can use MPLS Ping to find out if the poor performance is transient or as the result of other condition (which may last more than a day or hours) or result of switching to none optimal path
Minor change to RFC 4379 can make it possible Exact the same mode of operation as RFC 4379 (Echo Request and Echo Reply) Same Echo Request: –RFC4379 already defines I bit and N bit out of the octet DS Flags. This draft suggests adding a new bit C for source LSR to indicate if it desires to have the link impairment condition to be reported by transit LSR in the Echo Reply. Same Echo Reply with an additional sub-TLV Downstream Link Condition to indicate the condition of the downstream link of the corresponding interface. Sub-TypeValue Field TBDMultipath data (specified by [MPLS-Ping-Enhanced]) TBDLabel stack (specified by [MPLS-Ping-Enhanced]) TBDFEC Stack change (specified by [MPLS-Ping-Enhanced]) TBD Downstream Link Condition (new) S Transit node Echo Request Echo Reply Impaired link
Sub-TLV suggestion Downstream Link Condition sub-TLV | Type | Length |ImpairmentTyp | SeverityLevel | The Impairment Type field can take one of the following values: ValueMeaning port towards downstream LSR is congested 2 Bandwidth of the link towards downstream LSR is reduced 3 performance of the link towards downstream LSR is reduced 4 transport media of the link towards downstream LSR has been changed The Severity Level field is a value indicating the severity of the impairment. Network operator can set the Severity Level for anticipated conditions and configure the proper actions at the source node upon receiving the Echo Reply.