The l2circuit tunnels between an ACX1100 and ACX5048, stop working when the new ACX7024 is inserted
root@JTAC> show l2circuit connections
Layer-2 Circuit Connections:
Legend for connection status (St)
EI -- encapsulation invalid NP -- interface h/w not present
MM -- mtu mismatch Dn -- down
EM -- encapsulation mismatch VC-Dn -- Virtual circuit Down
CM -- control-word mismatch Up -- operational
VM -- vlan id mismatch CF -- Call admission control failure
OL -- no outgoing label IB -- TDM incompatible bitrate
NC -- intf encaps not CCC/TCC TM -- TDM misconfiguration
BK -- Backup Connection ST -- Standby Connection
CB -- rcvd cell-bundle size bad SP -- Static Pseudowire
LD -- local site signaled down RS -- remote site standby
RD -- remote site signaled down HS -- Hot-standby Connection
XX -- unknown
Legend for interface status
Up -- operational
Dn -- down
Neighbor: a.b.c.d
Interface Type St Time last up # Up trans
ae20.2100(vc 130) rmt VC-Dn ----- 0
Remote PE: 192.168.1.130, Negotiated control-word: No
Incoming label: 451328, Outgoing label: 1931
Negotiated PW status TLV: No
Local interface: ae20.2100, Status: Up, Encapsulation: ETHERNET
Flow Label Transmit: No, Flow Label Receive: No
ge-0/0/3.0(vc 500) rmt XX
Neighbor: 192.168.1.131
ge-0/0/2.770(vc 770) rmt LD
Neighbor: 192.168.1.141
Neighbor: 192.168.1.175
ae20.2100(vc 130) rmt BK
ge-0/0/3.0(vc 500) rmt BK
Neighbor: 192.168.1.234
ae23.0(vc 111) rmt VC-Dn ----- 0
Remote PE: 192.168.1.234, Negotiated control-word: Yes (Null)
Incoming label: 299792, Outgoing label: 320256
Local interface: ae23.0, Status: Up, Encapsulation: ETHERNET
Topology:
ACX5048 <-> ACX7024 <-> ACX1100
Observations:
> We observed that LDP session was flapping when interface was up.
> The session from ACX7024 & ACX5048, towards the ACX1100 was flapping.
> We could also see the interface going down between ACX7024 & ACX1100.
> Customer also confirmed that there are no issues for the l2ckt terminated on ACX7024.
> Further checking logs, we can see the reason for LDP session down at ACX7024 is "received notification from peer".
> Upon checking the ACX1100, we can see "hold time expired" for the LDP down events.
> There are no errors or drops seen for interfaces (ae & physical) on both side.
> But the config has some concerns, as while we have link speed being configured as 1g on ACX7024, the other end is having 100m speed config on interface.
> This is contradictory & could be the reason for the LDP flaps (interface speed is displayed 'Unspecified' in ACX7024 ae2).
ACX7024 Config:
ae2 {
traps;
mtu 4470;
aggregated-ether-options {
minimum-links 1;
link-speed 1g; <<<<<
|
Physical interface: ae2, Enabled, Physical link is Down
Interface index: 1006, SNMP ifIndex: 597, Generation: 609885357016
Link-level type: Ethernet, MTU: 4470, Speed: Unspecified, <<<<<
ACX1100 Config:
ge-0/0/1 {
speed 100m; <<<<<
gigether-options {
802.3ad ae2;
}
lacp {
Physical interface: ae2, Enabled, Physical link is Up
Interface index: 128, SNMP ifIndex: 516, Generation: 131
Link-level type: Ethernet, MTU: 4470, Speed: 100mbps, <<<<<
Solution:
Removed 100m config from ACX1100 child interface (ge-0/0/1), towards ACX7024.
And also set "speed 1g" in physical interface of ACX7024, which resolved the issue.