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New Member

Help with 7200, PPPoE, Virtual Templates, and PVCs

We are a telco and ISP offering DSL service to our customers, and currently have an OC-3 link from our Cisco 7200 to our ATM switch that aggregates the traffic. We currently have a vpdn group set up to accept the incoming connections, but I have some concerns about limitations and am looking for some advice (router info at the bottom). I thank you in advance for any help you can provide.

1. Is there a limit to the number of Virtual Access Interfaces that can be created on the 7200? When I do a 'clear vi ?', it shows the session number from 1-101, so I am very concerned. If it can support more than 101, do I need to create new vpdn groups? If not, is there another way I can terminate the sessions (i.e. not Virtual Access)?

2. Is there a limit to the number of pvcs that can have simultaneous connections on the 7200? I know the theoretical number is around 4000, but is there a more practical number when you begin seeing performance degradation?

---------------------Router Info ------------------------------

Cisco Internetwork Operating System Software

IOS (tm) 7200 Software (C7200-IS-M), Version 12.2(2)T, RELEASE SOFTWARE (fc1)

Copyright (c) 1986-2001 by cisco Systems, Inc.

Compiled Sun 03-Jun-01 03:55 by ccai

Image text-base: 0x600089C0, data-base: 0x61458000

ROM: System Bootstrap, Version 12.0(19990210:195103) [12.0XE 105], DEVELOPMENT SOFTWARE

BOOTFLASH: 7200 Software (C7200-BOOT-M), Version 12.0(10)S, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)

cisco 7206VXR (NPE300) processor (revision D) with 253952K/40960K bytes of memory.

Processor board ID 21300636

R7000 CPU at 262Mhz, Implementation 39, Rev 2.1, 256KB L2, 2048KB L3 Cache

6 slot VXR midplane, Version 2.1

Last reset from power-on

Bridging software.

X.25 software, Version 3.0.0.

1 FastEthernet/IEEE 802.3 interface(s)

2 Serial network interface(s)

1 ATM network interface(s)

125K bytes of non-volatile configuration memory.

20480K bytes of Flash PCMCIA card at slot 0 (Sector size 128K).

16384K bytes of Flash PCMCIA card at slot 1 (Sector size 128K).

4096K bytes of Flash internal SIMM (Sector size 256K).

Configuration register is 0x102

------------------Config Info (pertaining to this question)--------------------

boot system slot1:c7200-is-mz.122-2.T.bin

aaa new-model

aaa authentication login default line group radius

aaa authentication login conmethod enable

aaa authentication ppp default if-needed group radius local

aaa authorization network default group radius

aaa accounting exec default wait-start group radius

aaa accounting network default wait-start group radius


no ip dhcp-client network-discovery

async-bootp subnet-mask

async-bootp dns-server

vpdn enable

vpdn session-limit 10000


vpdn-group 1


protocol pppoe

virtual-template 1


call rsvp-sync


interface ATM1/0

ip address

no atm ilmi-keepalive

pvc 13/55

encapsulation aal5snap

protocol pppoe


pvc 13/56

encapsulation aal5snap

protocol pppoe

.... etc (ps. I know now how to do the range of pvcs, but haven't gone and reconfigured)

New Member

Re: Help with 7200, PPPoE, Virtual Templates, and PVCs

With the 12.2 code you should be able to create 10000 interfaces total, that includes the combination of physical, sub-interface, and virtual interfaces. The following link will give better detail

The maximum number of PVC's is 4096 depending on the actual interface card installed. There is no way to give a more practical number for degredation as it would depend on the amount of traffic going over these PVCs.

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