[j-nsp] CCC MPLS between EX4600 (ELS) and EX4200, just impossible?

[Robin Williams]

Hi all,

Has anyone ever attempted/succeeded at getting a CCC VPN (either 
ethernet-ccc or vlan-ccc) to work between a ELS switch like the EX4600 
and an old switch like the EX4200?  As far as I can see, all of the LSPs 
and the connection itself come up just fine, labels are shared correctly 
etc, but no traffic will pass back through the EX4600 CCC port, so it's 
presumably just dropped by the switch.

Pages like this seem to suggest it's not possible to use the same sort 
of workarounds as would be used to get en EX4200 to talk to an MX 
(pop/push etc at the MX end);
https://kb.juniper.net/InfoCenter/index?page=content&id=KB24409
"Note: This workaround does not work with the combination of different 
EX platforms. For example, EX8200 and EX4200/EX3200."

I guess what I'd be interested in knowing (as I can't seem to see it on 
my traffic dumps), is what the actual incompatibility is, in terms of 
the encapsulation/packets, which is different between the two switches, 
and whether there are any workarounds (all be it unsupported)?

The thing that stands out to me in a 'show interface', is that on the 
EX4600 the encapsulation shows as 'ethernet-ccc' or 'vlan-ccc' as I'd 
expect (and am familiar with on the ELS EX and MX platforms), but the 
EX4200 end suggests encapsulation 'ENET2', even though it's configured 
on the port with vlan-tagging and family ccc on the vlan unit (the 
config is obviously different than on the 4600, as you don't specify an 
encapsulation like that on the ex4200).  Anyone any idea how ENET2 
differs from ethernet/vlan-ccc encapsulation, and whether this could be 
the issue?  Output below.

Best,
Robin.





4200 output
-----------

admin at TEST-EX4200# show interfaces ge-0/0/12
vlan-tagging;
mtu 1588;
unit 633 {
     vlan-id 633;
     family ccc;
}

Logical interface ge-0/0/12.633 (Index 73) (SNMP ifIndex 547)
     Flags: Up SNMP-Traps 0x0 VLAN-Tag [ 0x8100.633 ]  Encapsulation: ENET2
     Input packets : 6023
     Output packets: 217474
     Protocol ccc, MTU: 1588
       Flags: Is-Primary

Connection/Circuit                Type        St      Time last up     # 
Up trans
test1-test2_vlan633             rmt-if      Up      Mar 23 
23:46:55           6
   ge-0/0/12.633                     intf  Up
   test1-test2_vlan633             tlsp  Up
   test2-test1_vlan633             rlsp  Up
   Incoming labels: 299856
   Outgoing labels: Push 25



4600 output
------------
admin at TEST-4600# show interfaces ge-0/0/12
vlan-tagging;
mtu 1588;
encapsulation vlan-ccc;
unit 633 {
     encapsulation vlan-ccc;
     vlan-id 633;
     family ccc;
}
Logical interface ge-0/0/12.633 (Index 555) (SNMP ifIndex 541)
     Flags: Up SNMP-Traps 0x4000 VLAN-Tag [ 0x8100.633 ] Encapsulation: 
VLAN-CCC
     Input packets : 0
     Output packets: 0
     Protocol ccc, MTU: 1588
       Flags: Is-Primary

Connection/Circuit                Type        St      Time last up     # 
Up trans
test2-test1_vlan633             rmt-if      Up      Jul 27 
00:29:05           8
   ge-0/0/12.633                     intf  Up
   test2-test1_vlan633             tlsp  Up
   test1-test2_vlan633             rlsp  Up
   Incoming labels: 25
   Outgoing labels: Push 299856