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N-to-1 Apipe configuration with N > 1 & ATM Virtual Trunking |
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Last Updated: 2012-03-12 Issue Version 1.0 |
Introduction
An Apipe service is an ATM pseudo-wire (PW) that provides a bi-directional point-to-point layer 2 connection of ATM service between two users/sites through an IP/MPLS network. ATM cells received on the ATM SAP are encapsulated into PW packets to be transported over IP/MPLS tunnels.
In release 1.0, the 7705 SAR only supported the Apipe service with N:1 cell mode where N=1, which implies that only one VCC or VPC is mapped to an Apipe. As of release 5.0.R1, the 7705 SAR supports the N:1 cell mode where N ≥ 1, that means that more than one ATM VCC (SAP) can be mapped to an Apipe.
ATM cell mode with virtual trunking (VT) is also supported as of release 5.0.R1. ATM virtual trunking provides a wire emulation service between two ATM ports, thus allowing the migration of existing ATM networks to a next-generation IP/MPLs infrastructure with ease.
Setup
Figure 1 - Network setup
Note: The 7470 is used to cross-connect the ATM traffic generated from the Adtech tester to the PE-1 ASAP ports 1/2/ [1, 2, 3].
Apipe creation
Configuration
All ASAP ports, which will be used as ATM SAPs, must be configured with the following:
configure
port <port-id>
tdm
ds1
channel-group 1
encap-type atm
atm
exit
no shutdown
exit
no shutdown
exit
exit
no shutdown
The ASAP ports can either be all DS1s or E1s.
PE-1, PE-2, and PE-3 have been pre-configured with the required CLI commands to enable full IP/MPLS reach-ability between them. Please refer to R1.0 configuration notes for those configuration commands.
ATM N >1 configuration between two 7705 SARs (PE-1 & PE-2) – multiple SAPs to multiple SAPs:
PE-1 and PE-2 have been configured with Apipe service 101, where multiple ATM SAPs in PE-1 and PE-2 are bond to the same sap-aggregation-group. The optional vcid-translation has been used to ensure unique VPI/VCI within the ATM PW.
PE-1 (10.10.10.125) configuration:
A:SAR8-125# configure service apipe 101 customer 2701 vc-type atm-vcc
A:SAR8-125>config>service>apipe# info
----------------------------------------------
description "N>1 with 7705 SAR"
sap-aggregation-group "with_SAR43" create
exit
sap 1/2/1.1:1/32 sap-aggregation-group "with_SAR43" create
atm
vcid-translation 11/32
exit
exit
sap 1/2/2.1:1/32 sap-aggregation-group "with_SAR43" create
atm
vcid-translation 12/32
exit
exit
sap 1/2/3.1:3/32 sap-aggregation-group "with_SAR43" create
atm
vcid-translation 13/32
exit
exit
sap 1/2/3.1:4/32 sap-aggregation-group "with_SAR43" create
exit
spoke-sdp 243:101 create
cell-concatenation
max-cells 4
max-delay 10
exit
exit
no shutdown
----------------------------------------------
PE-2 (10.10.10.43) configuration:
A:SARF-43# configure service apipe 101 customer 2701 vc-type atm-vcc
A:SARF-43>config>service>apipe# info
----------------------------------------------
description "N>1 with 7705 SAR"
sap-aggregation-group "with_SAR125" create
exit
sap 1/1/11.1:11/32 sap-aggregation-group "with_SAR125" create
exit
sap 1/1/12.1:11/32 sap-aggregation-group "with_SAR125" create
atm
vcid-translation 4/32
exit
exit
sap 1/1/12.1:12/32 sap-aggregation-group "with_SAR125" create
exit
sap 1/1/13.1:13/32 sap-aggregation-group "with_SAR125" create
exit
spoke-sdp 2125:101 create
cell-concatenation
max-cells 4
max-delay 10
exit
exit
no shutdown
----------------------------------------------
ATM N >1 configuration between the 7705 SAR (PE-1) multiple SAPs and 7750 SR (PE-3) single SAP:
PE-1 and PE-3 have been configured with Apipe service 201. The ATM SAPs in PE-1 are bond together using the same sap-aggregation-group “with_SR181” and then aggregated to one SAP endpoint in PE-3.
PE-1 (10.10.10.125) configuration:
A:SAR8-125# configure service apipe 201 customer 2701 vc-type atm-vcc
A:SAR8-125>config>service>apipe# info
----------------------------------------------
description "N>1 with 7750 SR"
sap-aggregation-group "with_SR181" create
exit
sap 1/2/1.1:1/50 sap-aggregation-group "with_SR181" create
exit
sap 1/2/2.1:2/50 sap-aggregation-group "with_SR181" create
exit
sap 1/2/3.1:3/50 sap-aggregation-group "with_SR181" create
exit
spoke-sdp 2181:102 create
exit
no shutdown
----------------------------------------------
PE-3 (10.10.191.181) configuration:
1. Create a connection profile that contains the list of expected VPI/VCI in the N > 1 Apipe from the remote end (i.e. PE-1).
A:SR7_181# configure connection-profile 2701
A:SR7_181>config>connprof# info
----------------------------------------------
description "ATM N>1"
member "1/50" create
exit
member "2/50" create
exit
member "3/50" create
exit
----------------------------------------------
2. Configure Apipe service with atm-cell vc-type.
3. Configure ATM VCC VC signal type override using this command <signaled-vc-type-override atm-vcc>.
4. Assign a new ATM SAP that refers to the pre-configured ATM connection profile number.
A:SR7_181# configure service apipe 201 customer 2701 vc-type atm-cell
A:SR7_181>config>service>apipe# info
----------------------------------------------
description "N>1 ATM"
signaled-vc-type-override atm-vcc
sap 1/2/1:cp.2701 create
atm
exit
exit
spoke-sdp 2125:102 create
exit
no shutdown
----------------------------------------------
Verification and troubleshooting
Verify that the services are up, including the SAPs and SDPs between the two 7705 SARs:
A:SAR8-125# show service id 101 base
===============================================================================
Service Basic Information
===============================================================================
Service Id : 101
Service Type : Apipe VLL Type : ATMVCC
Description : N>1 with 7705 SAR
Customer Id : 2701
Last Status Change: 10/24/2011 15:14:23
Last Mgmt Change : 10/24/2011 20:36:03
Admin State : Up Oper State : Up
MTU : 1508
Vc Switching : False
SAP Count : 4 SDP Bind Count : 1
-------------------------------------------------------------------------------
Service Access & Destination Points
-------------------------------------------------------------------------------
Identifier Type AdmMTU OprMTU Adm Opr
-------------------------------------------------------------------------------
with_SAR43
sap:1/2/1.1:1/32 atm 1524 1524 Up Up
sap:1/2/2.1:1/32 atm 1524 1524 Up Up
sap:1/2/3.1:3/32 atm 1524 1524 Up Up
sap:1/2/3.1:4/32 atm 1524 1524 Up Up
sdp:243:101 S(10.10.10.43) n/a 0 1550 Up Up
===============================================================================
A:SARF-43# show service id 101 base
===============================================================================
Service Basic Information
===============================================================================
Service Id : 101
Service Type : Apipe VLL Type : ATMVCC
Description : N>1 with 7705 SAR
Customer Id : 2701
Last Status Change: 10/24/2011 11:13:50
Last Mgmt Change : 10/24/2011 16:36:33
Admin State : Up Oper State : Up
MTU : 1508
Vc Switching : False
SAP Count : 4 SDP Bind Count : 1
-------------------------------------------------------------------------------
Service Access & Destination Points
-------------------------------------------------------------------------------
Identifier Type AdmMTU OprMTU Adm Opr
-------------------------------------------------------------------------------
with_SAR125
sap:1/1/11.1:11/32 atm 1524 1524 Up Up
sap:1/1/12.1:11/32 atm 1524 1524 Up Up
sap:1/1/12.1:12/32 atm 1524 1524 Up Up
sap:1/1/13.1:13/32 atm 1524 1524 Up Up
sdp:2125:101 S(10.10.10.125) n/a 0 1550 Up Up
===============================================================================
Verify that the services are up, including the SAPs and SDPs between the 7705 SAR and the 7750 SR:
A:SAR8-125# show service id 201 base
===============================================================================
Service Basic Information
===============================================================================
Service Id : 201
Service Type : Apipe VLL Type : ATMVCC
Description : N>1 with 7750 SR
Customer Id : 2701
Last Status Change: 10/24/2011 20:32:58
Last Mgmt Change : 10/24/2011 20:35:46
Admin State : Up Oper State : Up
MTU : 1508
Vc Switching : False
SAP Count : 3 SDP Bind Count : 1
-------------------------------------------------------------------------------
Service Access & Destination Points
-------------------------------------------------------------------------------
Identifier Type AdmMTU OprMTU Adm Opr
-------------------------------------------------------------------------------
with_SR181
sap:1/2/1.1:1/50 atm 1524 1524 Up Up
sap:1/2/2.1:2/50 atm 1524 1524 Up Up
sap:1/2/3.1:3/50 atm 1524 1524 Up Up
sdp:2181:102 S(10.10.191.181) n/a 0 1550 Up Up
===============================================================================
A:SR7_181# show service id 201 base
===============================================================================
Service Basic Information
===============================================================================
Service Id : 201 Vpn Id : 0
Service Type : Apipe VLL Type : ATMCell
Name : (Not Specified)
Description : N>1 ATM
Customer Id : 2701
Last Status Change: 10/24/2011 16:32:25
Last Mgmt Change : 10/24/2011 16:32:25
Admin State : Up Oper State : Up
MTU : 1508 Signaling Override: ATMVCC
Vc Switching : False
SAP Count : 1 SDP Bind Count : 1
-------------------------------------------------------------------------------
Service Access & Destination Points
-------------------------------------------------------------------------------
Identifier Type AdmMTU OprMTU Adm Opr
-------------------------------------------------------------------------------
sap:1/2/1:cp.2701 atm 1524 1524 Up Up
sdp:2125:102 S(10.10.10.125) Spok 0 1550 Up Up
===============================================================================
Verify the ATM connections on the ATM ports (only the show output for port 1/2/1.1 is displayed below):
A:SAR8-125# show port 1/2/1.1 atm connections
================================================================
ATM Connections, Port 1/2/1.1
================================================================
Owner Type Ing.TD Egr.TD Adm OAM Opr
----------------------------------------------------------------
1/32 SAP PVC 1 1 up up up
1/50 SAP PVC 1 1 up up up
================================================================
Verify the ATM stats per VC on the ATM ports (only the show output for port 1/2/1.1 is displayed below):
A:SAR8-125# show port 1/2/1.1 atm pvc detail
================================================================
ATM PVCs, Port 1/2/1.1
================================================================
VPI/VCI Owner Type Ing.TD Egr.TD Adm OAM Opr
----------------------------------------------------------------
1/32 SAP PVC 1 1 up up up
===============================================================================
ATM Statistics
===============================================================================
Input Output
-------------------------------------------------------------------------------
Octets 172664354 172664354
Cells 3257818 3257818
CLP=0 Cells 0 3257818
Dropped CLP=0 Cells 0 0
Dropped Cells (CLP=0+1) 0
Tagged Cells 0
===============================================================================
===============================================================================
ATM OAM Statistics
===============================================================================
Input Output
-------------------------------------------------------------------------------
Loopback 0 0
OAM Cells (generated) 0 0
===============================================================================
================================================================
ATM PVCs, Port 1/2/1.1
================================================================
VPI/VCI Owner Type Ing.TD Egr.TD Adm OAM Opr
----------------------------------------------------------------
1/50 SAP PVC 1 1 up up up
===============================================================================
ATM Statistics
===============================================================================
Input Output
-------------------------------------------------------------------------------
Octets 278103243 278103243
Cells 5247231 5247231
CLP=0 Cells 0 5247231
Dropped CLP=0 Cells 0 0
Dropped Cells (CLP=0+1) 0
Tagged Cells 0
===============================================================================
===============================================================================
ATM OAM Statistics
===============================================================================
Input Output
-------------------------------------------------------------------------------
Loopback 0 0
OAM Cells (generated) 0 124
To clear the ATM stats for a specific VPI/VCI within the ATM port, use the following command:
clear port 1/2/1.1 atm pvc 1/32 statistics
To clear the ATM stats for all configured VPI/VCI within the ATM port, use the following command:
clear port 1/2/1.1 atm pvc statistics
To monitor the ATM stats for a specific VPI/VCI, use the following command:
A:SAR8-125# monitor port 1/2/1.1 atm pvc 1/32 rate
===============================================================================
Monitor ATM statistics for ATM VCL 1/2/1.1:1/32
===============================================================================
Input Output
-------------------------------------------------------------------------------
-------------------------------------------------------------------------------
At time t = 0 sec (Base Statistics)
-------------------------------------------------------------------------------
Octets 55528524 55528418
Cells 1047708 1047706
CLP=0 Cells 0 1047706
Dropped CLP=0 Cells 0 0
Dropped Cells (CLP=0+1) 0
Tagged Cells 0
-------------------------------------------------------------------------------
At time t = 10 sec (Mode: Rate)
-------------------------------------------------------------------------------
Octets 62519 62519
Cells 1180 1180
CLP=0 Cells 0 1180
Dropped CLP=0 Cells 0 0
Dropped Cells (CLP=0+1) 0
Tagged Cells 0
Utilization (% of port capacity) 32.56 32.56
-------------------------------------------------------------------------------
At time t = 20 sec (Mode: Rate)
-------------------------------------------------------------------------------
Octets 62519 62519
Cells 1180 1180
CLP=0 Cells 0 1180
Dropped CLP=0 Cells 0 0
Dropped Cells (CLP=0+1) 0
Tagged Cells 0
Utilization (% of port capacity) 32.56 32.56
-------------------------------------------------------------------------------
At time t = 30 sec (Mode: Rate)
-------------------------------------------------------------------------------
Octets 62439 62439
Cells 1178 1178
CLP=0 Cells 0 1178
Dropped CLP=0 Cells 0 0
Dropped Cells (CLP=0+1) 0
Tagged Cells 0
Utilization (% of port capacity) 32.52 32.52
-------------------------------------------------------------------------------
<output omitted>…
If the VPI/VCI values configured within the same ATM PW are not unique (i.e. within the same sap-aggregation-group including the vcid-translation values), the SAPs with duplicate VPI/VCI are set to operationally status down with flag “ApipeSapVcIdNotUnique”.
*A:SAR8-125# configure service apipe 101
*A:SAR8-125>config>service>apipe# info
----------------------------------------------
description "N>1 with 7705 SAR"
sap-aggregation-group "with_SAR43" create
exit
sap 1/2/1.1:1/32 sap-aggregation-group "with_SAR43" create
atm
vcid-translation 4/32
exit
exit
sap 1/2/2.1:1/32 sap-aggregation-group "with_SAR43" create
atm
vcid-translation 12/32
exit
exit
sap 1/2/3.1:3/32 sap-aggregation-group "with_SAR43" create
atm
vcid-translation 13/32
exit
exit
sap 1/2/3.1:4/32 sap-aggregation-group "with_SAR43" create
exit
spoke-sdp 243:101 create
cell-concatenation
max-cells 4
max-delay 10
exit
exit
no shutdown
----------------------------------------------
*A:SAR8-125_CP# show service id 101 sap
===============================================================================
SAP(Summary), Service 101
===============================================================================
PortId SvcId Ing. Ing. Egr. Egr. Adm Opr
QoS Fltr QoS Fltr
-------------------------------------------------------------------------------
1/2/1.1:1/32 Up Down
1/2/2.1:1/32 Up Up
1/2/3.1:3/32 Up Up
1/2/3.1:4/32 Up Down
-------------------------------------------------------------------------------
Number of SAPs : 4
-------------------------------------------------------------------------------
===============================================================================
*A:SAR8-125# show service id 101 sap 1/2/1.1:1/32
===============================================================================
Service Access Points(SAP)
===============================================================================
Service Id : 101
SAP : 1/2/1.1:1/32 Encap : atm
Description : (Not Specified)
Admin State : Up Oper State : Down
Flags : ApipeSapVcIdNotUnique
Multi Svc Site : None
Last Status Change : 10/25/2011 19:21:58
Last Mgmt Change : 10/25/2011 19:21:58
Sap Aggregation Gr*: with_SAR43
===============================================================================
* indicates that the corresponding row element may have been truncated.
ATM Virtual Trunking (VT)
ATM virtual trunking can be configured in both distributed SAP and SAP-to-SAP service modes.
The configuration of the ATM virtual trunking is similar to the regular Apipe configuration; the only difference is that the vc-type is set to “atm-cell” instead of “atm-vcc”.
PE-2 (10.10.10.43) SAP-to-SAP configuration:
A:SARF-43# configure service apipe 401 customer 2701 vc-type atm-cell
A:SARF-43>config>service>apipe# info
----------------------------------------------
description "R5.0 ATM VT SAP to SAP"
sap 1/1/15.1 create
exit
sap 1/1/16.1 create
exit
no shutdown
----------------------------------------------
The above example shows virtual trunking configuration in ATM SAP-to-SAP service mode.