Hi, I have a problem with my LDP Neighbors when an ATM interface flaps. When the Physical IF flaps, the LDP Neighbors over other IF goes down.

The show buffers show me a peak at the same time of the failiure.

# sh buffers
Buffer elements:
     1118 in free list (500 max allowed)
     4022421 hits, 0 misses, 1119 created

Public buffer pools:
Small buffers, 104 bytes (total 50, permanent 50, peak 95 @ 4d19h):
     47 in free list (20 min, 150 max allowed)
     10116037 hits, 49 misses, 78 trims, 78 created
     3 failures (0 no memory)
Middle buffers, 600 bytes (total 28, permanent 25, peak 145 @ 3w1d):
     28 in free list (10 min, 150 max allowed)
     2400429 hits, 250 misses, 494 trims, 497 created
     51 failures (0 no memory)
Big buffers, 1536 bytes (total 50, permanent 50):
     50 in free list (5 min, 150 max allowed)
     410966 hits, 0 misses, 0 trims, 0 created
     0 failures (0 no memory)
VeryBig buffers, 4520 bytes (total 11, permanent 10, peak 13 @ 4d19h):
     10 in free list (0 min, 100 max allowed)
     319327 hits, 2 misses, 3 trims, 4 created
     0 failures (0 no memory)

: %ENTITY_ALARM-6-INFO: CLEAR CRITICAL AT2/0 Physical Port Link Down
%TDP-5-INFO: ATM2/0.239118: LDP started
%LINK-3-UPDOWN: Interface ATM2/0, changed state to up
. %LINEPROTO-5-UPDOWN: Line protocol on Interface ATM2/0, changed state to up
%LDP-5-NBRCHG: LDP Neighbor 10.10.66.171:0 (1) is UP
: %OSPF-5-ADJCHG: Process 66, Nbr 10.10.66.171 on ATM2/0.239118 from LOADING to FULL, Loading Done
%LDP-5-NBRCHG: LDP Neighbor 10.10.66.129:0 (4) is DOWN (Received error notification from peer: Holddown time expired)
: %LDP-5-NBRCHG: LDP Neighbor 10.10.66.50:0 (2) is DOWN (Received error notification from peer: Holddown time expired)
%LDP-5-NBRCHG: LDP Neighbor 10.10.66.230:0 (3) is DOWN (Received error notification from peer: Holddown time expired)
%LDP-5-NBRCHG: LDP Neighbor 10.10.66.50:0 (5) is UP
%LDP-5-NBRCHG: LDP Neighbor 10.10.66.230:0 (6) is UP
. %LDP-5-NBRCHG: LDP Neighbor 10.10.66.129:0 (2) is UP

Why is this ??