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Knowledge Base

AR157 unable to relay DHCP packets for bridge configuration

Publication Date:  2014-05-24  |   Views:  294  |   Downloads:  0  |   Author:  b00745015  |   Document ID:  EKB1000043297

Contents

Issue Description

Considering that is connected a PC in interface Eth0/0/0, and this PC has a dhcp client and must acquire ip from the network the customer is figuring out that the PC cannot acquire IP address. It seems that is not arriving any dhcp request in a DSLAM where is connected the AR157.

#
bridge 1
#
interface Atm0/0/0.10
bridge 1
pvc 0/36
  map bridge broadcast
#
interface Vlanif1
bridge 1
#
interface Ethernet0/0/0
port link-type access
#

Alarm Information

none.

Handling Process

adjust configuration. Instead of using subinterface, install bridge configuration into ATM physical interface. 

#
interface Atm0/0/0
bridge 1
pvc 0/36
  map bridge broadcast
#

This solved the problem.

Root Cause

bridge traffic statistics shows unicast and broadcast packets passing through the bridge.

[sonaecomctatestes]display bridge traffic bridge 1
Bridge 1 :
Input  :
         624 total, 0 bpdu, 1 single,
         114 multi, 509 broadcast,
Output :
         271 total, 0 bpdu, 0 single,
         74 multi, 197 broadcast,

[sonaecomctatestes]display bridge traffic interface ethernet 0/0/0
[sonaecomctatestes]
[sonaecomctatestes]
[sonaecomctatestes]display bridge traffic interface vl1
Bridge 1 :
Input  :
         628 total, 0 bpdu, 1 single,
         115 multi, 512 broadcast,
Output :
         30 total, 0 bpdu, 0 single,
         8 multi, 22 broadcast,
[sonaecomctatestes]

[sonaecomctatestes]display bridge traffic interface Atm0/0/0.10
Bridge 1 :
Input  :
         2 total, 0 bpdu, 0 single,
        0 multi, 2 broadcast,
Output :
         261 total, 0 bpdu, 0 single,
         69 multi, 192 broadcast,

Suggestions

none.