MSAN (Multi-Service Access Network) is an access network device that serves multi-services, such as ASDL, SHDSL, E1, POTS, Ethernet. The MSAN topology itself is usually a stacking (multilevel) or master-slave architecture, which means the slave node is used as an extension of the master's hand.
If there are not enough master nodes then the slave will be used to increase the master capacity. Chassis and module are usually the same between master and slave. To do stacking, the uplink card is utilized as a module stack. The services offered by MSAN are modular and stick to the MSAN chassis. For example, one ASDL (or IP-ASDL) card has 48 ports so that 48 ASDL customers can subscribe at speeds of up to 24 Mbps downstream and 3.5 Mbps upstream.
From the type of FTTx family, MSAN itself is more accurately called FTTC (Fiber to the Curb) because services will be distributed to customers from node cabinets located on the side of the road to residential users via copper. So Fiber is terminated at the MSAN node.
CONFIGURATION COMMAND
PE-JUNIPER-SS> telnet 1.1.1.1 routing-instance VRF-MSAN
Trying 1.1.1.1...
Connected to 1.1.1.1.
Escape character is '^]'.
MSAN00-NSN login: root
Password:
Last login:
root ttyp0 172.27.219.225 Thu Feb 5 08:38 - 08:59 (0+00:20)This time we will create a service with the requirement below :
- Port facing to the modem is: Port 6/70
- Port facing to the trunk (Metro/SW): Port 0/1
- Service VLAN: 666
- Management Modem VLAN: 31
First, we need to create a VLAN 31 for the management modem.
MSAN00-NSN# configure terminal
MSAN00-NSN(config)#
MSAN00-NSN(bridge)# vlan create 31MSAN00-NSN(bridge)# port lre 6/70 disableMSAN00-NSN(bridge)# vlan create 666- VPI 0 VCI 33 is for Modem Management
- VPI 1 VCI 34 is for Services
MSAN00-NSN(bridge)# lre 6/70 xdsl atm vcc 1 vpi 0 vci 33
MSAN00-NSN(bridge)# lre 6/70 xdsl atm vc create vpi 1 vci 34
MSAN00-NSN(bridge)# bridgeport 6/70/1 pvid 30
MSAN00-NSN(bridge)# bridgeport 6/70/2 pvid 666 MSAN00-NSN(bridge)# vlan add 31 0/1 t
MSAN00-NSN(bridge)# vlan add 31 6/70/1 u
MSAN00-NSN(bridge)# vlan add 666 0/1 t
MSAN00-NSN(bridge)# vlan add 666 6/70/2 uMSAN00-NSN(bridge)# port lre 6/70 enable.SHOW COMMAND
To see customer VLAN or management Modem VLAN, we can use this Command in MSAN
MSAN00-NSN# show vlan 31
|
VLAN ID | Ports (u: untagged port, t: tagged port)
|
--------------------------------------------------------------------------------
31 | 0/1t,6/70/1u
MSAN00-NSN# show vlan 666
|
VLAN ID | Ports (u: untagged port, t: tagged port)
|
--------------------------------------------------------------------------------
666 | 0/1t,6/70/2u MSAN00-NSN# show lre 6/70 xdsl atm vcctp-info
---------------------------------------------------------------------------
Admin Encaps. Chan. Alm Sev Loop Test Perf
PORT VCC State VPI VCI Type Usage Index Result Counters
---------------------------------------------------------------------------
06/70 1 enabled 0 33 llc 1 1 Not Available disabled
2 enabled 1 34 llc 1 1 Not Available disabled
===========================================================================MSAN00-NSN# show bridgeport 6/70/1
Port | PVIDs(o/i) .1p(o/i) -mode(o/i) TaggingMode ReplaceVID Usage(Admin/Oper)
| VCC-Aggr IPMode DSCP-Prof PrioTagging Multitagg UnspecVid
| Etype-Prof MAT max-hosts HostProto SrcMacAddress
----------------------------------------------------------------------------------------
6/70/1 | 31/1 0/0 set/def off (off) subscr/subscr
( 6701)| - IPoE none off off off
| none off 16 pppoe
| CircuitId=default(%N adsl 06/70:0.33) RemoteId=default(00:0f:bb:38:a2:
|>98) LeaveMode=ehtmode(EHTMode=on) maxJoinedGroups=10 maxNonPremiumChan
|>nels=10 maxMCBandwidth=unlimit minUCBandwidth=0kbps IpoaProviderRouter
|>IpAddress= ip-antispoofing=off MaxIPAddresses=8
----------------------------------------------------------------------------------------MSAN00-NSN# show bridgeport 6/70/2
Port | PVIDs(o/i) .1p(o/i) -mode(o/i) TaggingMode ReplaceVID Usage(Admin/Oper)
| VCC-Aggr IPMode DSCP-Prof PrioTagging Multitagg UnspecVid
| Etype-Prof MAT max-hosts HostProto SrcMacAddress
----------------------------------------------------------------------------------------
6/70/2 | 3667/1 0/0 set/def off (off) subscr/subscr
( 6702)| - IPoE none off off off
| none off 16 pppoe
| CircuitId=default(%N adsl 06/70:1.34) RemoteId=default(00:0f:bb:38:a2:
|>98) LeaveMode=ehtmode(EHTMode=on) maxJoinedGroups=10 maxNonPremiumChan
|>nels=10 maxMCBandwidth=unlimit minUCBandwidth=0kbps IpoaProviderRouter
|>IpAddress= ip-antispoofing=off MaxIPAddresses=8
----------------------------------------------------------------------------------------To view modem status along with SNR and Attenuation, we can use this Command in MSAN
MSAN00-NSN# show lre 6/70 xdsl phys-table detail xtuc
---------------------------------------------------------------------
Slot/Port - Side : 06/70 - xtuc
Admin/OperStatus : UP / UP
Detailed Oper. State : SHOWTIME_TC_SYNC
Invent. Serial No. :
Version No. : 00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00
country code vendor ident. vendor rev. no.
HS Vendor ID : b5:00 49:46:54:4e 82:b8
System Vendor ID : 00:00 00:00:00:00 00:00
Curr. Output Power : 122 * 0.1 dBm
Attainable Rate: 21232 kbps
Line Rate : 1024 kbps
Previous Line Rate : 1024 kbps
Current Status : NoDefect
Pwr Management State : L0 synchronized - full transmission
Last State Transm. : C-Showtime
Actual PSD : -471 * 0.1 dBm/Hz
Selftest Result : 0x0
SNR margin : 353 * 0.1 dB
Actual SNR Mode : virtual noise is inactive
Retransmission : not in use, mode set to forbidden
=====================================================================
- SNR = 34,5 dB
- Redaman = 13,4 dB
The maximum SNR value on this MSAN is 40 dB, which indicates that the network quality is very good. Between 18-30 dB indicates that the link is normal and running properly. Below 18 dB there is something that needs to check the network, whether the copper cable has a problem, or is there something causing the SNR to fall below.
I hope this article is useful. Don't forget to include the source if you want to copy the article.
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