[c-nsp] Would an MTU mis-match cause one-way ICMP over EoMPLS VC?

[Jason Lixfeld]

Diagram:

  siteA CE
     ||
+---++---+
| 7206PE |
+---++---+
    f2/0 (mtu 1500)
     ||
    f0/1 (mtu 1504)
+---++---+
| ME3400 |
+---++---+
    g0/1 (mtu 1504)
     ||
    g1/1 (mtu 9216)
+---++---+
|  7609  |
+---++---+
    g7/2 (mtu 9216)
     ||
    g0/0 (mtu 9216)
+---++---+
| 7301PE |
+---++---+
     ||
  siteB CE

I'm getting one-way ICMP over a VC that is terminated on the 7206PE;  
meaning ICMP echo requests sourced from siteA CE to siteB CE cannot be  
seen on the siteB CE.  However, ICMP echo requests sourced from the  
siteB CE can be seen on the siteA CE (but the echo reply packest are  
not seen by siteB CE).

I understand that MTU issues would most certainly cause problems if  
the packet size was closer to the 1500 byte mark (1474 or there about,  
depending, maybe), but would this particular MTU mis-match even cause  
issues with such small ICMP packets?

If MTU wouldn't cause this, then I'm back to square one with trying to  
figure out this one-way traffic thing I've got going on here.

Thanks in advance..