[j-nsp] Need help on ping output

[Sonny Franslay]

Hi all,

Recently I've just upgraded our M5 to Junos 5.3R3.4 from 5.0. Peculiar
thing is that one of our ATM pt-pt interface started to behave
strangely when we try to ping the neighboring interface. But traffic is
still able to transverse via the ATM PVC link normally.

Below is the ping output:

router> ping interface at-0/0/0.6 192.168.21.133
PING 192.168.21.133 (192.168.21.133): 56 data bytes
36 bytes from 10.254.1.2: Destination Host Unreachable
Vr HL TOS  Len   ID Flg  off TTL Pro  cks      Src      Dst
 4  5  00 0054 bc38   0 0000  fe  01 5430 192.168.21.134  192.168.21.133

36 bytes from 10.254.1.2: Destination Host Unreachable
Vr HL TOS  Len   ID Flg  off TTL Pro  cks      Src      Dst
 4  5  00 0054 bc79   0 0000  fe  01 53ef 192.168.21.134  192.168.21.133

36 bytes from 10.254.1.2: Destination Host Unreachable
Vr HL TOS  Len   ID Flg  off TTL Pro  cks      Src      Dst
 4  5  00 0054 bc81   0 0000  fe  01 53e7 192.168.21.134  192.168.21.133

^C
--- 192.168.21.133 ping statistics ---
7 packets transmitted, 0 packets received, 100% packet loss


No changes were done on the interface config after the junos upgrade.
There is no firewall filter configured on the interface either.

The config of the interface:

[edit]
router# show interfaces at-0/0/0 unit 6
encapsulation atm-snap;
vci 1.40;
oam-period 10;
family inet {
    address 192.168.21.134/30;
}
family mpls;

[edit]

I was hoping someone could help me decipher the meaning of the ping output
and what is the IP 10.254.1.2 signify?

Many thanks in advance.


/sonny