Issue Description
S5720 (V200R010C00SPC600) connect to Cisco Catalist 2960 by 2 links in eth-trunk.
Configuration example - KB EKB1000435123 (for Cisco 4506) did not help to solve the issue.
Eth-trunk at Huawei – DOWN, at Cisco – UP.
transparent.gif Alarm Information
Huawei S5720 diagnostic:
5f94909f6f634da288e3d90b0143be26
Cisco Catalist 2960 diagnostic:
81ff3f8b963e4d0aa6092c7e9b945d71
transparent.gif Handling Process
Huawei switch config:
interface Eth-Trunk11
description Cisco2960-4-2
port link-type trunk
port trunk allow-pass vlan 3 8 21 30 to 31
stp bpdu-filter enable
stp edged-port disable
mode lacp
interface GigabitEthernet0/0/14
undo negotiation auto
description Cisco2960-4-2_1
eth-trunk 11
interface GigabitEthernet1/0/14
undo negotiation auto
description Cisco2960-4-2_2
eth-trunk 11
Cisco 2960 switch config:
interface Port-channel1
description UpSwitch
switchport trunk allowed vlan 1,3,8,21
switchport mode trunk
interface GigabitEthernet1/0/25
description UpSwitch_1
switchport trunk allowed vlan 1,3,8,21
switchport mode trunk
channel-group 1 mode on
!
interface GigabitEthernet1/0/26
description UpSwitch_2
switchport trunk allowed vlan 1,3,8,21
switchport mode trunk
channel-group 1 mode on
transparent.gif Root Cause
As LACP is used in EtherChannel, at Cisco side interfaces must be added to EtherChannel in passive mode.
transparent.gif Solution
Modify Cisco switch configuration of port-channel group at member-Interface view :
channel-group 1 mode on ------>>> channel-group 1 mode passive