HSR ring strange issue

[KV971213]

Hello,

I have encountered a strange issue related to the hsr-ring interface (comprised of g1/3 and g1/4) on IE4000. In case both links get disconnected and the switch is rebooted, I have observed that although the hsr-channel's interface goes up as soon as I connect port 4 to the next hsr-node, the channel speed is not indicated and the ring is not functioning, even though the physical interface's speed, cable type, and duplex mode are recognized without any issues. Connecting port 3 of the channel to the previous node allows the HSR ring to operate normally. The strange thing is that from that point forward I can even disconnect port 3 again and the hsr-ring operates as it should with only port 4 connected

Any advice would be highly appreciated 

[Georg Pauwen]

Hello,

post a schematic drawing of your topology, as well as the relevant configurations of the devices involved.

[KV971213]

Thank you for the reply,

Simple ring topology like below:

"The configuration for each node is identical, as follows:"

interface HSR-ring2
 description hsr-ring
 switchport trunk allowed vlan xx
 switchport trunk native vlan yy
 switchport mode trunk
 switchport nonegotiate

interface GigabitEthernet1/3
 switchport trunk allowed vlan xx
 switchport trunk native vlan yy
 switchport mode trunk
 switchport nonegotiate
 lldp transmit
 lldp receive
 no ptp enable
 hsr-ring 2

interface GigabitEthernet1/4
 switchport trunk allowed vlan xx
 switchport trunk native vlan yy
 switchport mode trunk
 switchport nonegotiate
 lldp transmit
 lldp receive
 no ptp enable
 hsr-ring 2

Long story short, when the g1/3 is inactive, the hsr-ring won't come up after reloading a node.It is important to note that the node is capable of sending and receiving LLDP, CDP, and RPD packets to and from the next node in the clockwise direction. Connecting g1/3 will activate the ring, enabling IP communication from the node, and won't go down even if I disconnect the cable from g1/3 again. 

This is the output when the node is up with the hsr ring in a faulty state:

Port      Name               Status       Vlan       Duplex  Speed Type 

Gi1/3     XXXXXXXXXXXXXXX    connected    trunk        auto   auto Not Present
Gi1/4     XXXXXXXXXXXXXXX    connected    trunk      a-full a-1000 10/100/1000BaseTX

HS2       hsr-ring           connected    trunk        auto   auto

On activating g1/3 will display duplex and speed at HS2 interface as well.

Relative issues are not encountered when the node is rebooted having only the g1/3 active. The absence of g1/4 connection doesn't seem to affect the hsr-ring which comes up as soon as the node boots

[KV971213]

...

[Georg Pauwen]

Hello,

thanks for the drawing and the explanation. I wonder what happens if you enable CDP as well on the interfaces. I know it is optional, and I cannot really find a comprehensive explanation on what it does in HSR...

interface GigabitEthernet1/3
switchport trunk allowed vlan xx
switchport trunk native vlan yy
switchport mode trunk
switchport nonegotiate
lldp transmit
lldp receive
--> cdp enable
no ptp enable
hsr-ring 2

interface GigabitEthernet1/4
switchport trunk allowed vlan xx
switchport trunk native vlan yy
switchport mode trunk
switchport nonegotiate
lldp transmit
lldp receive
--> cdp enable
no ptp enable
hsr-ring 2

[KV971213]

CDP is enabled by default on each interface. However, I made a check and both interfaces show that CDP is running:

GigabitEthernet1/3 is up, line protocol is up
  Encapsulation ARPA
  Sending CDP packets every 60 seconds
  Holdtime is 180 seconds

GigabitEthernet1/4 is up, line protocol is up
  Encapsulation ARPA
  Sending CDP packets every 60 seconds
  Holdtime is 180 seconds

I believe is informative of the neighboring nodes and nothing more