我有几个 Cisco 1721 和一个 WIC-4ESW。我当时正在运行另一家公司的家庭路由器作为我的有线路由器，但我决定将其变成无线网桥，并使用我的额外思科作为我的路由器。我最近升级了我的服务计划，将我的服务计划从 8M 下行速率提高到了 18M。在他们对我的有线调制解调器进行了必要的处理后，我没有注意到速度有任何变化。我的提供商在其网络上有一个速度测试服务器可供测试，因此我开始测试我的速度，但在凌晨 2:00 时，我的下行速率仍然只有 6-8M。
我将电脑直接连接到电缆调制解调器，并进行了几次测试，发现几乎每次都能获得大约 18M 的下载速度。我重新打开思科，下载速度又回到了 6M。尝试了大约 3 次。
我检查了思科的所有接口，没有错误，也没有任何异常。然后我使用完全相同的电缆，制作了我的其他公司产品 路由器而不是网桥，然后再次运行测试......18M下降，三次。
谁能告诉我为什么我的思科速度这么慢？
我甚至尝试过从旧式 NAT 切换到 NVI，但这似乎更慢了……
我还尝试更改外部接口的 MAC 地址，认为我的提供商可能正在对我从 DHCP 获取的源地址执行 QOS。
谢谢，
肖恩
Cisco IOS Software, C1700 Software (C1700-ADVIPSERVICESK9-M), Version 12.4(25d))
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Wed 18-Aug-10 04:02 by prod_rel_team
ROM: System Bootstrap, Version 12.2(7r)XM2, RELEASE SOFTWARE (fc1)
router uptime is 30 minutes
System returned to ROM by reload at 06:27:19 UTC Fri Aug 9 2013
System image file is "flash:c1700-advipservicesk9-mz.124-25d.bin"
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Cisco 1721 (MPC860P) processor (revision 0x500) with 118050K/13022K bytes of me.
Processor board ID FOC09421G3V (436675680), with hardware revision 0000
MPC860P processor: part number 5, mask 2
1 Ethernet interface
5 FastEthernet interfaces
32K bytes of NVRAM.
32768K bytes of processor board System flash (Read/Write)
Configuration register is 0x2102
-------------------------------------------------------------------------------
router#sho inventory
NAME: "1721 chassis", DESCR: "1721 chassis, Hw Serial#: 436675680, Hw Revision:"
PID: 1721 , VID: 0x500, SN: FOC09421G3V (436675680)
NAME: "Chassis Slot", DESCR: "1700 Chassis Slot"
PID: 1700 Chassis Slot , VID: , SN:
NAME: "C1721 Mainboard", DESCR: "C1721 Mainboard"
PID: C1721 Mainboard , VID: 0x500, SN: FOC09421G3V (436675680)
NAME: "Daughter card slot:0", DESCR: "1700 DaughterCard Slot"
PID: 1700 DaughterCard Slot, VID: , SN:
NAME: "WAN Interface Card - 4 Port FE Switch", DESCR: "WAN Interface Card - 4 P"
PID: WIC-4ESW= , VID: 1.0, SN: FOC09144DZ1
NAME: "Ethernet0", DESCR: "PQUICC Ethernet"
PID: PQUICC Ethernet , VID: , SN:
NAME: "FastEthernet1", DESCR: "Fast Ethernet"
PID: Fast Ethernet , VID: , SN:
NAME: "FastEthernet2", DESCR: "Fast Ethernet"
PID: Fast Ethernet , VID: , SN:
NAME: "FastEthernet3", DESCR: "Fast Ethernet"
PID: Fast Ethernet , VID: , SN:
NAME: "FastEthernet4", DESCR: "Fast Ethernet"
PID: Fast Ethernet , VID: , SN:
NAME: "Daughter card slot:1", DESCR: "1700 DaughterCard Slot"
PID: 1700 DaughterCard Slot, VID: , SN:
NAME: "FastEthernet0", DESCR: "PQUICC_FEC"
PID: PQUICC_FEC , VID: , SN:
--------------------------------------------------------------------------------
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname router
!
boot-start-marker
boot-end-marker
!
logging buffered 60000 debugging
logging console critical
enable secret 5 xxx
!
aaa new-model
!
aaa authentication login default local
!
aaa session-id common
ip cef
!
ip domain name toad-host.com
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
!
username xxx
!
ip ssh version 2
!
interface FastEthernet0
mac-address 0004.4b16.8271
ip address dhcp
ip nat outside
ip virtual-reassembly
speed 100
full-duplex
!
interface FastEthernet1
description Inside
switchport access vlan 100
!
interface FastEthernet2
shutdown
!
interface FastEthernet3
shutdown
!
interface FastEthernet4
shutdown
!
interface Vlan1
no ip address
shutdown
!
interface Vlan100
ip address 192.168.1.1 255.255.255.0
ip nat inside
ip virtual-reassembly
!
ip forward-protocol nd
!
ip dns server
!
no ip http server
no ip http secure-server
ip nat inside source list 100 interface FastEthernet0 overload
ip nat inside source static tcp 192.168.1.10 22 interface FastEthernet0 22
!
logging trap debugging
logging 192.168.1.10
access-list 10 permit 192.168.1.0 0.0.0.255 log
access-list 10 deny any log
access-list 100 permit ip any any
!
control-plane
!
line con 0
logging synchronous
line aux 0
line vty 0 4
access-class 10 in
logging synchronous
transport input ssh
line vty 5 15
access-class 10 in
logging synchronous
transport input ssh
!
ntp clock-period 17180034
ntp server 192.5.41.41
ntp server 192.5.41.40
end
编辑：回应 Paul Rudnitskiy
router#sho ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 24.49.40.1 to network 0.0.0.0
172.16.0.0/32 is subnetted, 1 subnets
S 172.16.100.4 [254/0] via 24.49.40.1, FastEthernet0
24.0.0.0/22 is subnetted, 1 subnets
C 24.49.40.0 is directly connected, FastEthernet0
C 192.168.1.0/24 is directly connected, Vlan100
S* 0.0.0.0/0 [254/0] via 24.49.40.1
在我使用提供商的服务器进行速度测试时
CPU utilization for five seconds: 34%/32%; one minute: 7%; five minutes: 4%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
39 39132 700 55902 0.65% 0.10% 0.06% 0 Per-minute Jobs
163 1804 336 5369 0.40% 0.98% 0.40% 0 DNS Server Input
9 1512 4110 367 0.24% 0.58% 0.33% 0 ARP Input
162 1908 14331 133 0.16% 0.69% 0.37% 0 DNS Server
48 828 1873 442 0.16% 0.23% 0.14% 0 IP Input
151 60 53 1132 0.08% 0.01% 0.00% 0 Syslog
速度测试结束后立即进行。
CPU utilization for five seconds: 3%/3%; one minute: 8%; five minutes: 5%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
9 1580 4245 372 0.40% 0.51% 0.33% 0 ARP Input
48 840 1895 443 0.16% 0.19% 0.14% 0 IP Input
67 52 753 69 0.08% 0.00% 0.00% 0 IP Background
1 12 12 1000 0.00% 0.00% 0.00% 0 Chunk Manager
2 104 8376 12 0.00% 0.00% 0.00% 0 Load Meter
3 4 412 9 0.00% 0.00% 0.00% 0 Spanning Tree
4 4 1 4000 0.00% 0.00% 0.00% 0 EDDRI_MAIN
5 102004 6382 15983 0.00% 0.22% 0.23% 0 Check heaps
答案1
根据http://www.cisco.com/web/partners/downloads/765/tools/quickreference/routerperformance.pdf
1721的峰值吞吐能力为每秒12,000个数据包，数据包最多为1,500字节。
这意味着在理想、完美的条件下，1721 的最大速度为 17Mbps。NAT 和小数据包大约会减半。数据表显示 CEF 性能为 6.14Mbit/s。
1721 旨在以 T1 速度处理数据。
答案2
好的，我连接了两台机器：一台连接到板载 FE 端口，一台连接到 WIC-4ESW 上的端口。
- 我禁用了主机上的所有防火墙。在两个接口之间设置没有 NVI 的 NAT。
- 我运行了 3 次 iPerf，平均速度为 9.31 Mbps。
- 我关闭了 NAT，再次尝试，平均结果差不多。
然后我再次看了节目版本并注意到了。
1 Ethernet interface
5 FastEthernet interfaces
由于板载 FE 上只有一个，而 WIC-4ESW 有四个，所以我想知道其他以太网接口来自哪里。
经过一番研究，发现板载 FE 和 WIC 之间的任何路由或 WIC 上的 VLAN 间路由都限制为 10Mbps，因为额外的以太网接口是到 CPU 的链接。路由器性能指南中没有提到，但在 Cisco 网站的配置指南中隐藏得很深。
所以是的... 1721 将始终被限制（路由方面）到 CPU 的 10Mbps（全双工）链接。