某企业网核心为4506，接入基本为2950系列。核心有一块X 4548 GB&nbs p;-RJ业务板，其中48口上联到防火墙，其他下联到客户端。客户端网关指向核心机，上网速度奇慢。指向防火墙则速度正常，防火墙地址为172.16.1.1 核心配置如下：
core_switch#show run
Building configuration...
Current configuration : 6061 bytes
!
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
service compress-config
!
hostname core_switch
!
enable secret 5 $1$21p4$rcisbziyY7iFWx0w7jm6d.
enable password kindy
!
vtp mode transparent
ip subnet-zero
!
spanning-tree extend system-id
!
!
vlan 2
name vlan2
!
interface GigabitEthernet1/1
!
interface GigabitEthernet1/2
!
interface GigabitEthernet2/1
description To ZXC
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface GigabitEthernet2/2
description To HYS-310
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface GigabitEthernet2/3
description To HYS-303
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface GigabitEthernet2/4
description To PGZ
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface GigabitEthernet2/5
description To WLZ
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface GigabitEthernet2/6
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface GigabitEthernet3/1
description To BACK_24
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface GigabitEthernet3/2
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface GigabitEthernet3/3
!
interface GigabitEthernet3/4
!
interface GigabitEthernet3/5
!
interface GigabitEthernet3/6
!
interface GigabitEthernet4/1
switchport trunk encapsulation dot1q
switchport mode trunk
!
....
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