Two things:

1. The configuration for interfaces on your member 1 switch has been truncated. 
Just make sure the config is actually there and similar to the ports you were 
using to plug in for testing (i.e. that they are in the same vlan, etc. Do you 
learn mac addresses on member 1 when the pings don't work? Is spanning tree 
blocking at all?

2. Not sure what the recommendation of the day is on the 2-member VC, but you 
don't need the no-split-detection if you're explicitly forcing the 2nd unit 
into a purely line card role; no-split-detection is worthwhile in a 2-unit only 
config where either member may become master.

HTH
Paul Z

On Apr 3, 2012, at 17:27 , Brendan Mannella wrote:

> I could be completely wrong, but shouldn't the second 4200 be the
> backup RE and not forced to be a line card?
> 
> Could have something to do with it.
> 
> 
> 
> On Apr 3, 2012, at 8:24 PM, Dave Peters <d...@terabitsystems.com> wrote:
> 
>> Hi all--
>> 
>> Trying to test a VC with two EX4200s running 10.4R9.2.  Very simple.  I just 
>> can't get the backup (or line card) chassis to pass traffic.  Pinging the 
>> gateway out of the routing engine or master works fine.  Trying to ping 
>> through the backup/line card gives me nothing.  The VC is recognized (per 
>> the below).  Something simple I'm doing wrong, I know.  Here's some output 
>> (and thanks for any help you might provide):
>> 
>> root> show virtual-chassis
>> 
>> Preprovisioned Virtual Chassis
>> Virtual Chassis ID: a8ab.cf0b.66d6
>>                                         Mastership            Neighbor List
>> Member ID  Status   Serial No    Model    priority    Role      ID  Interface
>> 0 (FPC 0)  Prsnt    BP0209472119 ex4200-48t      129  Master*    1  vcp-0
>>                                                                1  vcp-1
>> 1 (FPC 1)  Prsnt    FV0211137957 ex4200-48t        0  Linecard   0  vcp-0
>>                                                                0  vcp-1
>> 
>> 
>> root> show virtual-chassis vc-port member 0
>> fpc0:
>> --------------------------------------------------------------------------
>> Interface   Type              Trunk  Status       Speed        Neighbor
>> or                             ID                 (mbps)       ID  Interface
>> PIC / Port
>> vcp-0       Dedicated           1    Up           32000        1   vcp-0
>> vcp-1       Dedicated           2    Up           32000        1   vcp-1
>> 
>> {master:0}
>> root> show virtual-chassis vc-port member 1
>> fpc1:
>> --------------------------------------------------------------------------
>> Interface   Type              Trunk  Status       Speed        Neighbor
>> or                             ID                 (mbps)       ID  Interface
>> PIC / Port
>> vcp-0       Dedicated           1    Up           32000        0   vcp-0
>> vcp-1       Dedicated           2    Up           32000        0   vcp-1
>> 
>> {master:0}
>> 
>> 
>> 
>> 
>> 
>> root> show configuration
>> ## Last commit: 2012-02-02 09:38:58 UTC by root
>> version 10.4R9.2;
>> system {
>>   root-authentication {
>>       encrypted-password bJ/GddyoJuiU2; ## SECRET-DATA
>>   }
>>   services {
>>       web-management {
>>           http;
>>       }
>>   }
>>   syslog {
>>       user * {
>>           any emergency;
>>       }
>>       file messages {
>>           any notice;
>>           authorization info;
>>       }
>>       file interactive-commands {
>>           interactive-commands any;
>>       }
>>   }
>> }
>> interfaces {
>>   ge-0/0/0 {
>>       unit 0 {
>>           family ethernet-switching;
>>       }
>>   }
>>   ge-0/0/1 {
>>       unit 0 {
>>           family ethernet-switching;
>>       }
>>   }
>>   ge-0/0/2 {
>>       unit 0 {
>>           family ethernet-switching;
>> 
>> *!truncated!*
>> 
>>   vlan {
>>       unit 0 {
>>           family inet {
>>               address 192.168.10.188/24;
>>           }
>>       }
>>   }
>> }
>> routing-options {
>>   static {
>>       route 0.0.0.0/0 next-hop 192.168.10.77;
>>   }
>> }
>> protocols {
>>   igmp-snooping {
>>       vlan all;
>>   }
>>   lldp {
>>       interface all;
>>   }
>>   lldp-med {
>>       interface all;
>>   }
>> }
>> ethernet-switching-options {
>>   storm-control {
>>       interface all;
>>   }
>> }
>> vlans {
>>   default {
>>       l3-interface vlan.0;
>>   }
>> }
>> poe {
>>   interface all;
>> }
>> virtual-chassis {
>>   preprovisioned;
>>   no-split-detection;
>>   member 1 {
>>       role line-card;
>>       serial-number FV0211137957;
>>   }
>>   member 0 {
>>       role routing-engine;
>>       serial-number BP0209472119;
>>   }
>> }
>> 
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