作者:邓聪聪
智能以太保护SEP（Smart Ethernet Protection）是一种专用于以太网链路层的环网协议。SEP是一种以太环路保护机制，它通过有选择性地阻塞网络环路冗余链路，来达到消除网络二层环路的目的，避免报文在环路网络中增生和无限循环，有效防止形成网络风暴。本人刚接手了一套网络，布局也不是太复杂，基本全是2层网络，所以就利用了sep这个小技术。
实例1：
sysname sw1 # vlan batch 11 to 12 4008 4094 # stp disable # sep segment 5 control-vlan 4008 block port optimal preempt delay 30 protected-instance 0 to 48 sep segment 10 control-vlan 4094 block port optimal preempt delay 30 tc-notify segment 5 protected-instance 0 to 48 # interface Vlanif12 ip address 10.1.1.1 255.255.255.224 # interface GigabitEthernet0/0/1 port link-type trunk port trunk allow-pass vlan 11 4008 stp disable sep segment 5 # interface GigabitEthernet0/0/2 port link-type access port default vlan 11 # interface GigabitEthernet0/0/3 shutdown port link-type trunk undo port trunk allow-pass vlan 1 port trunk allow-pass vlan 11 to 12 4008 stp disable sep segment 5 edge primary # interface GigabitEthernet0/0/5 shutdown port link-type trunk port trunk allow-pass vlan 11 4094 stp disable sep segment 10 edge primary #
sysname sw2 # stp disable # sep segment 5 control-vlan 4008 protected-instance 0 to 48 #
sep segment 11
control-vlan 100
block port optimal
preempt delay 30
tc-notify segment 5
protected-instance 0 to 48
interface GigabitEthernet0/0/1 port link-type trunk undo port trunk allow-pass vlan 1 port trunk allow-pass vlan 11 4008 stp disable sep segment 5 # interface GigabitEthernet0/0/2 port link-type trunk undo port trunk allow-pass vlan 1 port trunk allow-pass vlan 11 4008 stp disable sep segment 5
interface GigabitEthernet0/0/4
port link-type trunk
port trunk allow-pass vlan 11 100
stp disable
sep segment 11 edge primary
sysname sw3 # stp disable # sep segment 5 control-vlan 4008 protected-instance 0 to 48 sep segment 10 control-vlan 4094 tc-notify segment 5 protected-instance 0 to 48 # interface Vlanif11 ip address 1.1.1.30 255.255.255.224 # interface Vlanif12 ip address 10.1.1.2 255.255.255.224 # interface MEth0/0/1 # interface GigabitEthernet0/0/1 port link-type access port default vlan 11 # interface GigabitEthernet0/0/2 port link-type trunk undo port trunk allow-pass vlan 1 port trunk allow-pass vlan 11 4008 stp disable sep segment 5 # interface GigabitEthernet0/0/3 port link-type trunk undo port trunk allow-pass vlan 1 port trunk allow-pass vlan 11 to 12 4008 stp disable sep segment 5 sep segment 5 priority 128 # interface GigabitEthernet0/0/4 port link-type trunk undo port trunk allow-pass vlan 1 port trunk allow-pass vlan 11 4094 stp disable sep segment 10 sep segment 10 priority 128 #
sysname sw4 # vlan batch 11 4094 # stp disable # sep segment 10 control-vlan 4094 protected-instance 0 to 48 #
sep segment 11
control-vlan 100
tc-notify segment 10
protected-instance 0 to 48
interface Vlanif11 ip address 1.1.1.4 255.255.255.224 #
interface GigabitEthernet0/0/3
port link-type trunk
port trunk allow-pass vlan 11 100
stp disable
sep segment 11
sep segment 11 priority 128
interface GigabitEthernet0/0/4 port link-type trunk undo port trunk allow-pass vlan 1 port trunk allow-pass vlan 11 4094 stp disable sep segment 10 # interface GigabitEthernet0/0/5 port link-type trunk port trunk allow-pass vlan 11 4094 stp disable sep segment 10
sysname sw5 # sep segment 11 control-vlan 100 protected-instance 0 to 48 # interface GigabitEthernet0/0/3 port link-type trunk port trunk allow-pass vlan 11 100 stp disable sep segment 11 # interface GigabitEthernet0/0/4 port link-type trunk port trunk allow-pass vlan 11 100 stp disable sep segment 11 #
实例2：
9306配置：
sep segment 1
control-vlan 4094
block port optimal
preempt delay 30
tc-notify segment 2
protected-instance 0 to 48
sep segment 2
control-vlan 4094
block port optimal
preempt delay 15
tc-notify segment 1
protected-instance 0 to 48
sep segment 3
control-vlan 4090
block port optimal
preempt delay 15
protected-instance 0 to 48
#
interface Vlanif1
ip address 1.1.1.1 255.255.255.0
#
interface MEth0/0/1
#
interface GigabitEthernet0/0/1
shutdown
port hybrid tagged vlan 4094
stp disable
sep segment 1 edge secondary
#
interface GigabitEthernet0/0/2
port link-type trunk
port trunk allow-pass vlan 4094
stp disable
sep segment 2 edge primary
#
interface GigabitEthernet0/0/3
port hybrid tagged vlan 4094
stp disable
sep segment 1 edge primary
#
interface GigabitEthernet0/0/4
port hybrid tagged vlan 4090
stp disable
sep segment 3 edge primary
#
interface GigabitEthernet0/0/5
port hybrid tagged vlan 4090
stp disable
sep segment 3 edge secondary
#
分支1-5700配置：
sep segment 1 control-vlan 4094 block port optimal protected-instance 0 to 48 # interface Vlanif1 ip address 1.1.1.254 255.255.255.0 # interface MEth0/0/1 # interface GigabitEthernet0/0/1 port hybrid tagged vlan 4094 stp disable sep segment 1 # interface GigabitEthernet0/0/2 port hybrid tagged vlan 4094 stp disable sep segment 1 #
分支3-5700配置：
sep segment 1
control-vlan 4094
tc-notify segment 2
protected-instance 0 to 48
sep segment 2
control-vlan 4094
tc-notify segment 1
protected-instance 0 to 48
#
interface Vlanif1
ip address 1.1.1.2 255.255.255.0
#
interface MEth0/0/1
#
interface GigabitEthernet0/0/1
port link-type trunk
port trunk allow-pass vlan 4094
stp disable
sep segment 2 edge secondary
#
interface GigabitEthernet0/0/2
port hybrid tagged vlan 4094
stp disable
sep segment 1
sep segment 1 priority 128
#
interface GigabitEthernet0/0/3
port hybrid tagged vlan 4094
stp disable
sep segment 1
#
分支2-5700配置：
sep segment 2
control-vlan 4094
protected-instance 0 to 48
#
interface Vlanif1
ip address 1.1.1.3 255.255.255.0
#
interface MEth0/0/1
#
interface GigabitEthernet0/0/1
port hybrid tagged vlan 4094
stp disable
sep segment 2
sep segment 2 priority 128
#
interface GigabitEthernet0/0/2
shutdown
port hybrid tagged vlan 4094
stp disable
sep segment 2
分支1配置：
sep segment 3 control-vlan 4090 protected-instance 0 to 48 # interface Vlanif1 # interface MEth0/0/1 # interface GigabitEthernet0/0/1 port hybrid tagged vlan 4090 stp disable sep segment 3 # interface GigabitEthernet0/0/4 port hybrid tagged vlan 4090 stp disable sep segment 3 #
分支2配置：
sep segment 3 control-vlan 4090 protected-instance 0 to 48 # interface Vlanif1 ip address 1.1.1.6 255.255.255.0 # interface MEth0/0/1 # interface GigabitEthernet0/0/1 port hybrid tagged vlan 4090 stp disable sep segment 3 sep segment 3 priority 128 # interface GigabitEthernet0/0/5 port hybrid tagged vlan 4090 stp disable sep segment 3