Here is config of MX960 interface:
root@MX960-re0> show configuration interfaces ae2
description EX3300;
flexible-vlan-tagging;
mtu 9192;
encapsulation flexible-ethernet-services;
aggregated-ether-options {
minimum-links 1;
lacp {
active;
}
}
unit 10 {
description MGMT;
vlan-id 10;
family inet {
address 10.100.10.17/28;
}
}
----------------------------------------------------------
-interface on EX toward MX:
root@EX3300> show configuration interfaces ae2
description MX960_ae2;
mtu 9192;
aggregated-ether-options {
minimum-links 1;
lacp {
active;
}
}
unit 0 {
family ethernet-switching {
port-mode trunk;
vlan {
members MGMT;
}
}
}
-Interface on EX toward SRX:
root@EX3300> show configuration interfaces ae0
description to_SRX3400_ae0;
mtu 9192;
aggregated-ether-options {
minimum-links 1;
}
unit 0 {
family ethernet-switching {
port-mode trunk;
vlan {
members MGMT;
}
}
}
I've created L3 interface on EX in vlan MGMT (10.100.10.18) and ping works between MX and EX.
when I try ping from SRX (10.100.10.20) to MX (10.100.10.17), I see ping requests coming on MX:
root@MX960>monitor traffic interface ae2.10
11:14:34.901290 In IP 10.100.10.20 > 10.100.10.17: ICMP echo request, id 5145, seq 32, length 64
11:14:34.901315 Out IP truncated-ip - 34 bytes missing! 10.100.10.17 > 10.100.10.20: ICMP echo reply, id 5145, seq 32, length 64
11:14:35.902671 In IP 10.100.10.20 > 10.100.10.17: ICMP echo request, id 5145, seq 33, length 64
11:14:35.902699 Out IP truncated-ip - 34 bytes missing! 10.100.10.17 > 10.100.10.20: ICMP echo reply, id 5145, seq 33, length 64
11:14:36.932513 In IP 10.100.10.20 > 10.100.10.17: ICMP echo request, id 5145, seq 34, length 64
11:14:36.932544 Out IP truncated-ip - 34 bytes missing! 10.100.10.17 > 10.100.10.20: ICMP echo reply, id 5145, seq 34, length 64
11:14:37.904466 In IP 10.100.10.20 > 10.100.10.17: ICMP echo request, id 5145, seq 35, length 64
11:14:37.904495 Out IP truncated-ip - 34 bytes missing! 10.100.10.17 > 10.100.10.20: ICMP echo reply, id 5145, seq 35, length 64
....
On SRX interface ae0.10 counters are increasing, but no ping reply!
root@SRX3400-DC> show interfaces ae0.10
Logical interface ae0.10 (Index 67) (SNMP ifIndex 501)
Flags: SNMP-Traps 0x0 VLAN-Tag [ 0x8100.10 ] Encapsulation: ENET2
Statistics Packets pps Bytes bps
Bundle:
Input : 281 0 24840 0
Output: 485 0 47958 0
Security: Zone: MGMT
Allowed host-inbound traffic : bootp bfd bgp dns dvmrp igmp ldp msdp nhrp
ospf pgm pim rip router-discovery rsvp sap vrrp dhcp finger ftp tftp
ident-reset http https ike netconf ping reverse-telnet reverse-ssh rlogin
rpm rsh snmp snmp-trap ssh telnet traceroute xnm-clear-text xnm-ssl lsping
ntp sip r2cp
Protocol inet, MTU: 9174
Flags: Sendbcast-pkt-to-re
Addresses, Flags: Is-Preferred Is-Primary
Destination: 10.100.10.16/28, Local: 10.100.10.20,
Broadcast: 10.100.10.31
Protocol multiservice, MTU: Unlimited
------------------------------------------------------------------------------
I did flow trace - please find it attached.