[c-nsp] mulitlink ppp stays up but stops responding when any link is dropped

[Christopher Hunt]

	Does anyone understand why the far end of a Mutlilink interface would stay up but stop responding to a ping _for_approx_60_secs_ when any of the individual T1 interfaces in the bundle go down?  The near end, the Multi2 interface on the 7200, continues to respond to a ping the entire time.  The output of "sh int multi2" indicates that packets are flowing out and IN but I'm not able to ping several hosts (all i tried) at the far end.  

	Here's a sanitized copy of the config which hasn't changed recently.  

!!!7200!!!!
interface Serial2/6:0
 ip vrf forwarding TestCust
 no ip address
 encapsulation ppp
 ppp multilink
 ppp multilink group 2
!
interface Serial2/7:0
 ip vrf forwarding TestCust
 no ip address
 encapsulation ppp
 ppp multilink
 ppp multilink group 2

interface Multilink2
 ip vrf forwarding TestCust
 ip address 10.10.12.1 255.255.255.252
 ppp multilink
 ppp multilink group 2
 service-policy input IN-POLICY01
 service-policy output OUT-POLICY-10M

rtr1#sh int multi2
Multilink2 is up, line protocol is up 
  Hardware is multilink group interface
  Internet address is 10.10.12.1/30
  MTU 1500 bytes, BW 1536 Kbit, DLY 100000 usec, 
     reliability 255/255, txload 9/255, rxload 6/255
  Encapsulation PPP, LCP Open, multilink Open
  Open: IPCP, loopback not set
  Keepalive set (10 sec)
  DTR is pulsed for 2 seconds on reset

!!!!2800!!!!
interface Multilink1
 bandwidth 3072
 ip address 10.10.12.2 255.255.255.252
 ip nbar protocol-discovery
 no cdp enable
 ppp multilink
 ppp multilink group 1
 service-policy output 2T1_VOIP_Policy
!
interface Serial0/0/0:0
 no ip address
 encapsulation ppp
 ppp multilink
 ppp multilink group 1
!
interface Serial0/0/1:0
 no ip address
 encapsulation ppp
 ppp multilink
 ppp multilink group 1

Thanks a bunch...
-- 
Christopher Hunt
ReachONE Internet, Inc.
(360)456-5640
http://www.reachone.com