Got it

Unable to ping from MSK to/from SPB bidirectionally

Latest reply: Dec 29, 2018 01:22:34 2286 7 0 0 0

Hello everyone,

This post refers to the issue of being unable to ping from MSK to/from SPB bidirectionally, because of a topology too simple. Please find more details below.

SPB:

interface GigabitEthernet0/0/0
#
interface GigabitEthernet0/0/0.4
 description to__MSK
 dot1q termination vid 4
 ip address 172.16.2.2 255.255.255.252

Provider:

vlan 4
  description Interconnection
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 4
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 4
MSK:

interface GigabitEthernet0/0/1
#
interface GigabitEthernet0/0/1.4
 description SPB
 dot1q termination vid 4
 ip address 172.16.2.1 255.255.255.252
Any idea? Too simple topology and it can't be implemented.

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Sir_Z
Created Jan 12, 2018 06:17:00

SPB (Router), MSK (Router), Provider (S3700)
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Sir_Z
Sir_Z Created Jan 12, 2018 10:41:54 (0) (0)
eNSP version 1.2.00.510 
WoodWood
Created Jan 12, 2018 09:11:25

@KD35 please help
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Sir_Z
Created Jan 12, 2018 10:45:01

One more bug router/switch never can ping PC first, only after PC start ping. Too old bug.
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Sir_Z
Created Jan 12, 2018 12:53:47

I found solution.
SPB:
interface GigabitEthernet0/0/0.4
  arp broadcast enable

MSK:
interface GigabitEthernet0/0/1.4

 arp broadcast enable

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Sir_Z
Sir_Z Created Jan 12, 2018 12:55:34 (0) (0)
Reason: "Because subinterfaces for VLAN tag termination discard broadcast packets after receiving the packets."
Solution: "Just enable ARP broadcast on subinterfaces" 
4am
Created Dec 29, 2018 01:22:34

The ARP broadcast function is disabled on the sub-interface of the router by default. Therefore, this problem does not occur if you use the main interface.
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