1 vp tunnels and vp switching © 2001, cisco systems, inc. vp tunnels and vp switching switching...

1VP Tunnels and VP Switching © 2001, Cisco Systems, Inc. www.cisco.com

VP Tunnels and VP SwitchingVP Tunnels and VP Switching

Switching decision is made solely based on VPI number (unlike both VPI and VCI for VC switching) which reduces administration as well as allows for faster switching of cells.

Some Concepts

VP interface is a multiplexing/demultiplexing point on ATM switch at which VC’s from various (ATM interfaces) are aggregated to VP on an Interface.

VP’s are ATM connections that are aggregate of multiple VC’s that all have same VPI number.

VP’s are most often used across WANs.

VP Switching

VP Tunnels



1- VC (Virtual Channel): VC’s are uniquely identified on port of ATM switch by VPI and VCI number.

2- VP (Virtual Path): VP’s are uniquely identified on ATM port by VPI number on ATM port.

There are 2 major type of ATM connections

VC

VC

Transmission Path

VP

VPVP

VP

VC

VC

Virtual Path

ATM cells arriving on VC are switched based on both VPI and VCI number in cell header.

On other hand ATM cells arriving on VP are Switched based on VPI number only.

Configuration of ATM switch will determine If switch is supposed to be VC or VP switchingFor specific VPI/VCI pair or VPI respectively.



•A cell is switch at VC or VP level.

•VC Switching - Switch receive a cell with a configured VPI and VCI, it lookup its connection table to determine outgoing port (or ports) with new VPI/VCI value.

OR

Port VPI Port VPI 1 2 4 7 2 5 3 1

VC and VP Switching

Port 1VPI 2VCI 100VCI 110

Port 2VPI 5VCI 110

Port 3 VPI 1 VCI 50

Port 4 VPI 7 VCI 100VCI 110

Port VPI/VCI Port VPI/VCI1 2/100 4 7/1101 2/110 3 1/50

5/110 4 7/1002


interface ATM5/1/0

no ip address

no atm ilmi-keepalive

!

interface ATM5/1/0.1 point-to-point

ip address 1.1.1.1 255.255.255.0

pvc 10/20

encapsulation aal5snap

!


ip address 2.1.1.1 255.255.255.0

pvc 10/30


!


ip address 3.1.1.1 255.255.255.0

pvc 11/40

interface ATM0/0/1

no ip address

atm pvp 10 interface ATM0/0/0 10


interface ATM0/0/1

no ip address



interface ATM0/0/0

no ip address

no atm ilmi-keepalive

!


ip address 1.1.1.2 255.255.255.0

pvc 10/20


!


ip address 2.1.1.2 255.255.255.0

pvc 10/30


!


ip address 3.1.1.2 255.255.255.0

pvc 12/40



Atm5/1/0 Atm0/0/1 Atm0/0/0 Atm0/0/0 Atm0/0/1 Atm0/0/0

Check this out

Configuring VP Switching



Switch#sh atm vpInterface VPI Type X-Interface X-VPI StatusATM0/0/0 10 PVP ATM0/0/1 10 UPATM0/0/0 11 PVP ATM0/0/1 12 UPATM0/0/1 10 PVP ATM0/0/0 10 UPATM0/0/1 12 PVP ATM0/0/0 11 UP

Switch#sh atm vp traffi int atm0/0/0 Interface VPI Type rx-cell-cnts tx-cell-cntsATM0/0/0 10 PVP 70 60ATM0/0/0 11 PVP 94 90

Show Commands for VP Switching



Switch#sh atm vp int atm0/0/0 10

Interface: ATM0/0/0, Type: oc3suni VPI = 10 Status: UPTime-since-last-status-change: 00:58:11Connection-type: PVP Cast-type: point-to-pointCross-connect-interface: ATM0/0/1, Type: oc3suni Cross-connect-VPI = 10 Rx connection-traffic-table-index: 1Rx service-category: UBR (Unspecified Bit Rate)Rx pcr-clp01: 7113539Rx scr-clp01: noneRx mcr-clp01: noneRx cdvt: 1024 (from default for interface)Rx mbs: noneTx connection-traffic-table-index: 1Tx service-category: UBR (Unspecified Bit Rate)Tx pcr-clp01: 7113539Tx scr-clp01: noneTx mcr-clp01: noneTx cdvt: noneTx mbs: none

Show Commands for VP Switching



Three different types of VP Tunnels on Cisco Enterprise ATM Switches

1- Regular or Unshaped VP Tunnels

2- Shaped VP Tunnels

3- Hierarchical VP Tunnels



VP tunnels on which there is no traffic shaping for any ATM service category. VP can be of any service category but can’t be shaped. VC’s in a tunnel have to be of same service category VP tunnel is.

Regular or Unshaped VP Tunnels


Atm0/0/0Atm0/0/0

Atm5/1/0 Atm0/0/1 Atm0/0/1 Atm0/0/0

Router 1

interface ATM5/1/0.1 point-to-point ip address 1.1.1.1 255.255.255.0 pvc 100/32 encapsulation aal5snap ! interface ATM5/1/0.2 point-to-point ip address 2.1.1.1 255.255.255.0 pvc 100/33 encapsulation aal5snap

Switch 1

interface ATM0/0/0 no ip addressatm pvp 100 ! interface ATM0/0/0.100 point-to-point no ip directed-broadcast no atm ilmi-keepalive! interface ATM0/0/1 no ip address no ip directed-broadcast logging event subif-link-status atm ilmi-keepalive atm svcc vci min 100 atm pvc 100 32 interface ATM0/0/0.100 100 32 atm pvc 100 33 interface ATM0/0/0.100 100 33 !

Switch 2

interface ATM0/0/0 no ip address atm pvp 100 !interface ATM0/0/0.100 point-to-point!interface ATM0/0/1 no ip address atm pvc 100 32 interface ATM0/0/0.100 100 32 atm pvc 100 40 interface ATM0/0/0.100 100 33 !

Router 2

interface ATM0/0/0.1 point-to-point ip address 1.1.1.2 255.255.255.0 pvc 100/32 encapsulation aal5snap ! interface ATM0/0/0.2 point-to-point ip address 2.1.1.2 255.255.255.0 pvc 100/40 encapsulation aal5snap !

Public PVP

WANTunnel

Tunnel


Configuring VP Tunnels for a Single Service Category



Switch#sh atm vp int atm 0/0/0 100

Interface: ATM0/0/0, Type: oc3suni VPI = 100 Status: TUNNELTime-since-last-status-change: 17:21:32Connection-type: PVP Cast-type: point-to-pointRx cells: 49968, Tx cells: 50371Rx connection-traffic-table-index: 1Rx service-category: UBR (Unspecified Bit Rate)Rx pcr-clp01: 7113539Rx scr-clp01: noneRx mcr-clp01: noneRx cdvt: 1024 (from default for interface)Rx mbs: noneTx connection-traffic-table-index: 1Tx service-category: UBR (Unspecified Bit Rate)Tx pcr-clp01: 7113539Tx scr-clp01: noneTx mcr-clp01: noneTx cdvt: noneTx mbs: none

Show Commands for VP Tunnels



Switch#sh atm vp Interface VPI Type X-Interface X-VPI StatusATM0/0/0 100 PVP TUNNEL

Switch#sh atm vp traffic int atm0/0/0Interface VPI Type rx-cell-cnts tx-cell-cntsATM0/0/0 100 PVP 49865 50271

Show Commands for VP Tunnels



Atm0/0/0Atm0/0/0

Atm5/1/0 Atm0/0/1 Atm0/0/1 Atm0/0/0

Router 1

interface ATM5/1/0.1 point-to-point ip address 1.1.1.1 255.255.255.0 pvc 100/32 vbr-nrt 50000 40000 100 encapsulation aal5snap !!interface ATM5/1/0.2 point-to-point ip address 2.1.1.1 255.255.255.0 pvc 100/33 vbr-nrt 10000 8000 100 encapsulation aal5snap !

Switch 1

interface ATM0/0/0 no ip address atm pvp 100 rx-cttr 7 tx-cttr 7 !interface ATM0/0/0.100 point-to-point no ip directed-broadcast no atm ilmi-keepalive!interface ATM0/0/1 no ip address atm pvc 100 32 rx-cttr 8 tx-cttr 8 interface ATM0/0/0.100 100 32 atm pvc 100 33 rx-cttr 9 tx-cttr 9 interface ATM0/0/0.100 100 33 !

Switch 2

interface ATM0/0/0 no ip address atm pvp 100 rx-cttr 7 tx-cttr 7 !interface ATM0/0/0.100 point-to-point! interface ATM0/0/1 no ip address atm pvc 100 32 rx-cttr 8 tx-cttr 8 interface ATM0/0/0.100 100 32 atm pvc 100 40 rx-cttr 9 tx-cttr 9 interface ATM0/0/0.100 100 33

Router 2

interface ATM0/0/0.1 point-to-point ip address 1.1.1.2 255.255.255.0 pvc 100/32 vbr-nrt 50000 40000 100 encapsulation aal5snap !interface ATM0/0/0.2 point-to-point ip address 2.1.1.2 255.255.255.0 pvc 100/40 vbr-nrt 10000 8000 100 encapsulation aal5snap

Configuring VP Tunnels for a Single Service Category

Public PVP

WAN



Switch

c8510m-r2#sh atm vp int atm 0/0/0 100

Interface: ATM0/0/0, Type: oc3suni VPI = 100 Status: TUNNELTime-since-last-status-change: 00:43:49Connection-type: PVP Cast-type: point-to-pointRx connection-traffic-table-index: 7Rx service-category: VBR-NRT (Non-Realtime Variable Bit Rate)Rx pcr-clp01: 100000Rx scr-clp0 : 80000Rx mcr-clp01: noneRx cdvt: 1024 (from default for interface)Rx mbs: 100Tx connection-traffic-table-index: 7Tx service-category: VBR-NRT (Non-Realtime Variable Bit Rate)Tx pcr-clp01: 100000Tx scr-clp0 : 80000Tx mcr-clp01: noneTx cdvt: noneTx mbs: 100

Show Commands



Minimum Hardware/Software requirements and Type of VP Tunnel supported on Cisco equipment.

1- Unshaped VP Tunnel of any service category is supported on LS1010 (with eother FC-PCQ and FC-PFQ),Catalyst 8540-MSR, Catalyst 8510-MSR, 7500 series router with PA-A3 and 7200 series router with PA-A2 orPA-A3. Any 11.2, 11.3 or 12.0 IOS supports this feature . VC’s within unshaped tunnel have to be of same Service category that unshaped VP tunnel is.

2- Shaped VP Tunnel of CBR service category is supported on LS1010 with FC-PFQ, Catalyst 8510-MSR, Catalyst 8540-MSR, 7500 series router with PA-A3 and 7200 series router with PA-A2 or PA-A3. All VC’s Within CBR VP Tunnel have to be of same service category.

2.1- Shaped VP Tunnels are first supported in 11.2(8.0.1)FWA4 vs of IOS 11.1 and WA3 release trains do not Support shaped VP Tunnels.

2.2- For software vs after 11.3(0.8)TWA4 it is supported for service category of VC’swithin shaped tunnel To be on CBR.

2.3- For earlier software vs that do support shaped VP tunnel VC’s within shaped CBR tunnel have to be of CBR service category.

3- Hierarchical VP Tunnels of CBR service category are supported on LS1010 with FC-PFQ, Catalyst 8510-MSR and Catalyst 8540-MSR. Minimum software requirement is W5 train of IOS.



???

If the VP Service Provider is Policing, the connection will most likely experience cell drops in the Service Provider network.

Q: How to overcome this?

A: Configure Shaped VP Tunnels.



VP Tunnels that are traffic shaped. They are defined only for CBR service category on Cisco Enterprise ATM Switches. All VC’s within single VP Tunnel must be same service category. The overall output of this VP Tunnel is rate-limited by hardware to the PCR of the tunnel.

Shaped VP Tunnels



Atm0/0/0Atm0/0/0

Atm5/1/0 Atm0/0/1 Atm0/0/1 Atm0/0/0

Public PVP

WAN

Switch 1

atm connection-traffic-table-row index 10 cbr pcr 8000 atm connection-traffic-table-row index 20 vbr-nrt pcr 7000 scr0 4000 mbs 100atm connection-traffic-table-row index 30 ubr pcr 8000 atm connection-traffic-table-row index 40 abr pcr 8000 mcr 0!interface ATM0/0/0 no ip address atm pvp 100 shaped rx-cttr 10 tx-cttr 10 atm pvp 110 shaped rx-cttr 10 tx-cttr 10 atm pvp 120 shaped rx-cttr 10 tx-cttr 10 ! interface ATM0/0/0.100 point-to-point atm cac service-category cbr deny atm cac service-category vbr-nrt permit! interface ATM0/0/0.110 point-to-point atm cac service-category cbr deny atm cac service-category ubr permit! interface ATM0/0/0.120 point-to-point atm cac service-category cbr deny atm cac service-category abr permit! interface ATM0/0/1 no ip address atm pvc 100 32 rx-cttr 20 tx-cttr 20 interface ATM0/0/0.100 100 32 atm pvc 110 40 rx-cttr 30 tx-cttr 30 interface ATM0/0/0.110 110 40 atm pvc 120 50 rx-cttr 40 tx-cttr 40 interface ATM0/0/0.120 120 50

Router 1

interface ATM5/1/0.1 point-to-point ip address 1.1.1.1 255.255.255.0 pvc 100/32 vbr-nrt 7000 4000 100 encapsulation aal5snap ! interface ATM5/1/0.2 point-to-point ip address 2.1.1.1 255.255.255.0 pvc 110/40 ubr 8000 ! interface ATM5/1/0.3 point-to-point ip address 3.1.1.1 255.255.255.0 pvc 120/50 abr 8000 5000

Configuring Shaped VP Tunnels



Switch 2

atm connection-traffic-table-row index 10 cbr pcr 8000 atm connection-traffic-table-row index 20 vbr-nrt pcr 7000 scr0 4000 mbs 100atm connection-traffic-table-row index 30 ubr pcr 8000 atm connection-traffic-table-row index 40 abr pcr 8000 mcr 0!interface ATM0/0/0 no ip address atm pvp 100 shaped rx-cttr 10 tx-cttr 10 atm pvp 110 shaped rx-cttr 10 tx-cttr 10 atm pvp 120 shaped rx-cttr 10 tx-cttr 10 ! interface ATM0/0/0.100 point-to-point atm cac service-category cbr deny atm cac service-category vbr-nrt permit! interface ATM0/0/0.110 point-to-point atm cac service-category cbr deny atm cac service-category ubr permit! interface ATM0/0/0.120 point-to-point no atm ilmi-keepalive atm cac service-category cbr deny atm cac service-category abr permit! interface ATM0/0/1 no ip address atm pvc 100 32 rx-cttr 20 tx-cttr 20 interface ATM0/0/0.100 100 32 atm pvc 110 40 rx-cttr 30 tx-cttr 30 interface ATM0/0/0.110 110 40 atm pvc 120 50 rx-cttr 40 tx-cttr 40 interface ATM0/0/0.120 120 50

Router 2

interface ATM0/0/0.1 point-to-point ip address 1.1.1.2 255.255.255.0 pvc 100/32 vbr-nrt 7000 4000 100 encapsulation aal5snap ! interface ATM0/0/0.2 point-to-point ip address 2.1.1.2 255.255.255.0 pvc 110/40 ubr 8000 ! interface ATM0/0/0.3 point-to-point ip address 3.1.1.2 255.255.255.0 pvc 120/50 abr 8000 5000

Configuring Shaped VP Tunnels



Switch#sh atm vp int atm0/0/0Interface VPI Type X-Interface X-VPI StatusATM0/0/0 100 PVP SHAPED TUNNELATM0/0/0 110 PVP SHAPED TUNNELATM0/0/0 120 PVP SHAPED TUNNEL

Switch#sh atm vp traffic int atm0/0/0Interface VPI Type rx-cell-cnts tx-cell-cntsATM0/0/0 100 PVP 1438 1446ATM0/0/0 110 PVP 1374 1384ATM0/0/0 120 PVP 755 772

Show Commands for Shaped VP Tunnels



Switch#sh atm int atm0/0/0.110

Interface: ATM0/0/0.110 Port-type: vp tunnelIF Status: UP Admin Status: up

Show Commands for Shaped VP Tunnels



Restrictions for Shaped VP tunnels

1- LS1010 with FC-PFQ and Catalyst 8510-MSR support maximum of 2x64=128 shaped VP Tunnels:64 shaped VP Tunnels are supported on x/0/y numbered ports and 64 on x/1/y numbered ports.

2- Catalyst 8540-MSR supports maximum of 8x64=512 shaped VP tunnels: maximum of 64 shaped VP tunnelsCan be defined on each of the following interface groups: (0/0/x, 1/0/x), (0/1/x, 1/1/x), (2/0/x, 3/0/x), (2/1/x, 3/1/x),(9/0/x, 10/0/x), (9/1/x, 10/1/x), (11/0/x, 12/0/x), and (11/1/x, 12/1/x).

3- The bandwidth of the shaped VP tunnel is shared by the active VC’s inside the tunnel in strict round-robin(RR) fashion.

4- Shaped VP tunnels do not support merged VC’s for tag switching.

5- UBR+ and ABR VC’s with non-zero MCR are not allowed on a shaped VP tunnel interface.

6- A maximum of 128 VC’s can transit s shaped VP tunnel interface.



Q: What if I have more than 1 service category and cann’t buy more than 1 VP Tunnel?

A: Configure Hierarchical VP Tunnel

???



VP Tunnels that are traffic shaped and support VC’s of multiple service categories to co-exist in tunnel at the same time.

Hierarchical VP Tunnels



Atm0/0/0Atm2/1/0

Atm5/1/0 Atm0/0/1 Atm2/1/1 Atm0/0/0

Public PVP

WAN

Router 1

interface ATM5/1/0.1 point-to-point ip address 1.1.1.1 255.255.255.0 pvc 100/32 vbr-nrt 7000 4000 100 encapsulation aal5snap ! interface ATM5/1/0.2 point-to-point ip address 2.1.1.1 255.255.255.0 pvc 100/40 ubr 8000 encapsulation aal5snap ! interface ATM5/1/0.3 point-to-point ip address 3.1.1.1 255.255.255.0 pvc 100/50 abr 8000 5000 encapsulation aal5snap

Switch 1

atm hierarchical-tunnel atm connection-traffic-table-row index 20 vbr-nrt pcr 7000 scr0 4000 mbs 100atm connection-traffic-table-row index 30 ubr pcr 8000 atm connection-traffic-table-row index 40 abr pcr 8000 mcr 0atm connection-traffic-table-row index 50 cbr pcr 50000 !interface ATM0/0/0 no ip address no ip directed-broadcast logging event subif-link-status atm pvp 100 hierarchical rx-cttr 50 tx-cttr 50 ! interface ATM0/0/0.100 point-to-point no ip directed-broadcast no atm ilmi-keepalive! interface ATM0/0/1 no ip address no ip directed-broadcast logging event subif-link-status atm pvc 100 32 rx-cttr 20 tx-cttr 20 interface ATM0/0/0.100 100 32 atm pvc 100 40 rx-cttr 30 tx-cttr 30 interface ATM0/0/0.100 100 40 atm pvc 100 50 rx-cttr 40 tx-cttr 40 interface ATM0/0/0.100 100 50

Configuring Hierarchical VP Tunnels for Multiple Services Categories



Switch 2

atm hierarchical-tunnel atm connection-traffic-table-row index 20 vbr-nrt pcr 7000 scr0 4000 mbs 100atm connection-traffic-table-row index 30 ubr pcr 8000 atm connection-traffic-table-row index 40 abr pcr 8000 mcr 0atm connection-traffic-table-row index 50 cbr pcr 50000 !interface ATM2/1/0 no ip address atm pvp 100 hierarchical rx-cttr 50 tx-cttr 50 ! interface ATM2/1/0.100 point-to-point! interface ATM2/1/1 no ip address atm pvc 100 32 rx-cttr 20 tx-cttr 20 interface ATM2/1/0.100 100 32 atm pvc 100 40 rx-cttr 30 tx-cttr 30 interface ATM2/1/0.100 100 40 atm pvc 100 50 rx-cttr 40 tx-cttr 40 interface ATM2/1/0.100 100 50

Router 2

interface ATM0/0/0.1 point-to-point ip address 1.1.1.2 255.255.255.0 pvc 100/32 vbr-nrt 7000 4000 100 encapsulation aal5snap !interface ATM0/0/0.2 point-to-point ip address 2.1.1.2 255.255.255.0 pvc 100/40 ubr 8000 encapsulation aal5snap !interface ATM0/0/0.3 point-to-point ip address 3.1.1.2 255.255.255.0 pvc 100/50 abr 8000 5000 encapsulation aal5snap

Configuring Hierarchical VP Tunnels for Multiple Services Categories



Switch#sh atm vpInterface VPI Type X-Interface X-VPI StatusATM2/1/0 100 PVP HIE. TUNNEL

Switch#sh atm resourceResource configuration: Sustained-cell-rate-margin-factor 1% Abr-mode: EFCI Hierarchical Scheduling Mode : enabled

*****TRUNCATED******

Switch#sh atm vp traffic int atm 2/1/0 100Interface VPI Type rx-cell-cnts tx-cell-cntsATM2/1/0 100 PVP 2451 2470

Show Commands for Hierarchical VP Tunnels



Switch#sh atm vp int atm2/1/0 100

Interface: ATM2/1/0, Type: oc3suni VPI = 100 Status: HIE. TUNNELTime-since-last-status-change: 00:49:16Connection-type: PVP Cast-type: point-to-pointRx cells: 2214, Tx cells: 2234

Rx connection-traffic-table-index: 50Rx service-category: CBR (Constant Bit Rate)Tx connection-traffic-table-index: 50Tx service-category: CBR (Constant Bit Rate)Tx pcr-clp01: 50000Tx scr-clp01: noneTx mcr-clp01: noneTx cdvt: noneTx mbs: none

Show Commands for Hierarchical VP Tunnels



Restriction for Hierarchical VP Tunnels

1- LS1010 with FC-PFQ, Catalyst 5500 with ASP and FC-PFQ and Catalyst 8510-MSR support maximum of62 hierarchical VP Tunnels.

2- Hierarchical VP Tunnels can only be defined on ports in slots 0 and 3 on LS1010 and Catalyst 8510-MSR.Hierarchical VP Tunnels can be defined in slots 9 and 11 on Catalyst 5500 with ASP and FC-PFQ.

3- LS1010 equiped with FC-PFQ and ASP-B supports maximum of 30 hierarchical VP tunnels on ports 0/0/zAnd 3/0/z combined, and maximum of 32 on ports 0/1/z and 3/1/z combined. Use “sh hardware” command to Find out type of ASP and feature card.

4- LS1010 equiped with FC-PFQ and ASP-C as well as Catalyst 8510-MSR support maximum of 30 Hierarchical VP tunnels on ports 0/y/z and maximum of 32 on ports 3/y/z.

5- On Catalyst 5500 with ASP and FC-PFQ Maximum of 30 hierarchical VP tunnels can be defined on ports 9/0/z and11/0/7 combined. Maximum of 32 hierarchical VP tunnels can be defined on ports 9/1/z and 11/1/z Combined.

6- On Catalyst 8540-MSR hierarchical VP tunnels can be defined on slots 0,2,9 and 11.



Restriction for Hierarchical VP Tunnels

7- Maximum number of hierarchical VP Tunnels varies between 120 and 240 depending on type of PAM’sUsed. If all the ports are Super PAM’s (full with modules) the maximum number of VP tunnels supportedIs 240. If all the ports installed are Supper Cam’s with LS1010 PAM’s maximum number of hierarchicalVP tunnels is 120.

8- Hierarchical VP tunnels can not co-exist with any other type of connection (VC’s, VP’s, Tag VC’s regularOr shaped VP tunnels etc.) on the same physical interface. So, the only type of connection that can coexistWith hierarchical VP tunnel on same physical interface are additional hierarchical VP tunnels and well Known VC’s (signaling 0/5, PNNI, 0/18, ILMI 0/16 etc.).

9- Hierarchical VP Tunnels can support only ATM Forum VC’s or only Tag VC’s, but not both at the same time.

10- When doing OIR (on line insertion and removal) of PAM that has hierarchical VP tunnels configuredFor its ports, configuration of hierarchical tunnel will be preserved. So if same PAM is inserted backIn hierarchical VP Tunnel will automaticly be active. However,if different type of PAM is to be insertedIt is strongly recommended that any configured hierarchical VP Tunnel (on port about to be removed) beDeleted prior to physical removal of PAM.



Some Acronyms

VP: virtual pathVC: virtual channelVPI: virtual path identifierVCI: virtual channel identifierABR: available bit rateCBR: constant bit rateUBR: unspecified bit rateVBR-nrt: variable bit rate – no real timeVBR-rt: variable bit rate – real timePCR: peak cell rateSCR: sustained cell rateMBS: maximum burst sizeFC-PFQ: feature card- per flow queueing

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