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1、S5750E交换机GRE配置案例
拓扑：PC1---g0/23--SW1--g0/1------------g0/2--SW2-----PC2
SW1交换机配置如下：
interface
GigabitEthernet 0/1------->与SW2互联口配置
no switchport
no ip proxy-arp
ip address 1.1.1.1 255.255.255.0
!
interface
GigabitEthernet 0/23----->连用户的端口
no switchport
no ip proxy-arp
ip address 192.168.1.1 255.255.255.0
!
interface
Loopback 0 ----->GRE的源接口
ip address 11.11.11.11 255.255.255.0
!
interface Tunnel
0 ----->隧道口配置
ip address 12.1.1.1 255.255.255.0
tunnel mode gre ip ----->默认是ipv6ip，必须配置为gre模式
tunnel source Loopback 0 ---->设置gre的源口
tunnel destination 22.22.22.22 ----->设置gre的目的
!
ip route
22.22.22.0 255.255.255.0 1.1.1.2
---->两个GRE的源口之间必须路由可达
ip route
192.168.2.0 255.255.255.0 Tunnel 0
------->用户之间的路由
SW2交换机配置如下：
interface
GigabitEthernet 0/1
no switchport
no ip proxy-arp
ip address 1.1.1.2 255.255.255.0
!
interface
GigabitEthernet 0/23
no switchport
no ip proxy-arp
ip address 192.168.2.1 255.255.255.0
!
interface
Loopback 0
ip address 22.22.22.22 255.255.255.0
!
interface
Loopback 1
ip address 192.168.10.1 255.255.255.0
!
interface Tunnel
0
ip address 12.1.1.2 255.255.255.0
tunnel mode gre ip
tunnel source Loopback 0
tunnel destination 11.11.11.11
!
ip route
11.11.11.0 255.255.255.0 1.1.1.1
ip route
192.168.1.0 255.255.255.0 Tunnel 0
2、S57-E/P、S6000、S6220、S5760是否支持GRE隧道功能
S5750-24GT/8SFP-E、S5750-48GT/4SFP-E
、S5750-24GT/8SFP-P、S5750-48GT/4SFP-P、S5750-24SFP/8GT-E、S6000-24GT/8SFP、S6000-48GT/4SFP、S6220支持；
S5760不支持；
3、S5750E交换机是否支持更改GRE隧道的MTU
不支持，不能更改接口的MTU
Ruijie(config-if-Tunnel
0)#mtu 1500
% Interface
Tunnel 0 does not support adjustable maximum datagram size.
默认的MTU为1476
Ruijie#show int
tunnel 0
Index(dec):25
(hex):19
Tunnel 0 is
UP , line protocol is UP
Hardware is Tunnel
Interface
address is: 12.1.1.2/24
MTU 1476 bytes, BW 9 Kbit
Encapsulation protocol is Tunnel,
loopback not set
Keepalive interval is no set
Carrier delay is 2 sec
Rxload is 1/255, Txload is 1/255
Tunnel source 22.22.22.22 (Loopback 0),
destination 11.11.11.11
Tunnel TOS/Traffic Class not set, Tunnel
TTL 255
Tunnel protocol/transport GRE/IP
4、S5750E交换机配置GRE隧道是否支持分片
支持分片，并且是由CPU上进行分片，并非在芯片上进行分片，这样大量的报文需要分片，有可能导致CPU过高。
主要的进程如下：
Ruijie#show cpu
=======================================
CPU Using Rate
Information
CPU utilization
in five seconds: 21.33%
CPU utilization
in one minute : 4.07%
CPU utilization
in five minutes: 2.56%
NO 5Sec 1Min 5Min Process
0 0.00% 0.02% 0.02% LISR INT
1 0.64% 0.07% 0.01% HISR INT
2 0.16% 0.13% 0.13% ktimer
3 0.22% 0.15% 0.15% atimer
66
10.45% 1.20% 0.24% tnet //这个表示IP报文比较多
175 5.73% 0.66% 0.13% pk_rx_task_0 //表示收包进程比较多
202 0.26% 0.24% 0.24% Tssptimer
203 0.54% 0.06% 0.01% pk_inb_free_task
204 0.09% 0.08% 0.08% hal_cnc_task
237 1.57% 0.18% 0.04% nac_filter_tsk
238 0.00% 0.00% 0.00% lml_sfp_task
239 0.34% 0.03% 0.11% rl_con
240 78.67% 95.93% 97.44% idle
CPP发现other报文值比较大
SW1#show
cpu-protect
%cpu port
bandwidth: 6000(pps)
Traffic-class Bandwidth(pps) Rate(pps)
------------- -------------- ---------
0
1000
237
1
1000
1
2
1500
0
3
1500
0
4
1500
0
5
1500
0
6
3500
0
Packet Type
Traffic-class
Bandwidth(pps)
Rate(pps) Drop(pps)
---------------- ------------- -------------- --------- ---------
other
0
1000
237
0 //GRE分片后的报文，被归类为other
bfd
6
3500
0
0
dldp
6
1000
0
0