problem with pppoe sessions

Unanswered Question
Jun 22nd, 2009
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why when the connections overcomes 420 - 430 sessions they begin to be rejected??


aaa new-model

aaa authentication ppp default local group radius

aaa authorization network default local group radius

aaa accounting network default

action-type start-stop

group radius

aaa session-id common

clock timezone Argenti 4

clock calendar-valid


ip source-route

ip cef

ip name-server x.x.x.x

ip address-pool local

no ipv6 cef

multilink bundle-name authenticated

memory-size iomem 0

username Administrator privilege 15 secret 5 $1$4PF8$VUGfHaUj1Wu4UX7OCcrMU.


log config


bba-group pppoe global

virtual-template 1

sessions max limit 8000

sessions per-vc limit 8

sessions per-mac limit 2

interface FastEthernet0/0

ip address

duplex full

speed auto

interface GigabitEthernet0/0

ip address a.a.a.a

duplex auto

speed auto

media-type rj45

negotiation auto

interface GigabitEthernet0/1

no ip address

no ip mroute-cache

duplex auto

speed auto

media-type rj45

negotiation auto

vlan-range dot1q 1 1000

pppoe enable group global



interface Virtual-Template1

description ClientesPPPoE

mtu 1492

ip unnumbered GigabitEthernet0/0

peer default ip address pool ip-pool

ppp authentication pap


ip local pool ip-pool b.b.b.b c.c.c.c

ip forward-protocol nd

ip route d.d.d.d

no ip http server

no ip http secure-server

dialer-list 1 protocol ip permit

radius-server host e.e.e.e auth-port 1645 acct-port 1646

radius-server key serverkey


no call rsvp-sync

mgcp fax t38 ecm

dial-peer cor custom


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Giuseppe Larosa Mon, 06/22/2009 - 10:06
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Hello Jorge,

each session uses resources.

More specifically one entry in the IDB (interface database descriptor ) is used.

Different platforms have different limits for the size of the IDB table.

A Cisco 10000 can handle 20,000 and more sessions but an ISR like 2800 or 3800 cannot.



I see from your other thread that you are using a C7201.

Hope to help


gorguecalafate Mon, 06/22/2009 - 11:28
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both issues are from the C7201. This router have a limit of 8k sessions (the license i acquire say that) but i dont understand why have this problem, sure i'm doing something wrong


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