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btk_
Asked: 2013-08-09 23:42:33 +0800 CST

Cisco 1721 速度慢

  • 772

我有几个 Cisco 1721 和一个 WIC-4ESW。我正在运行另一家公司的家用路由器作为我的有线路由器，但决定将其变成无线网桥并使用我额外的思科作为我的路由器。我最近通过我的提供商升级了我的服务计划，从 8M 降到了 18M。在他们对我的电缆调制解调器做了他们需要的事情之后，我没有注意到速度上有任何差异。我的提供商在他们的网络上有一个速度测试服务器来测试，所以我开始测试我的速度，我仍然会在凌晨 2:00 下降 6-8M。

  • 我将我的计算机直接连接到电缆调制解调器并运行了几次测试，并注意到我几乎每次都下降了大约 18M。我把思科重新打开，回到 6M 下来。试了大约3次。

  • 我检查了 Cisco 上的所有接口，没有错误，也没有任何异常。然后，我使用完全相同的电缆，让我的其他公司生产 路由器而不是网桥，并再次运行测试...... 18M 下降了 3 次。

谁能告诉我为什么我的 Cisco 速度如此之慢？

我什至尝试从旧式 NAT 切换到 NVI，但这似乎更慢......

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 获得的源地址执行 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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If you require further assistance please contact us by sending email to
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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

在使用我的提供商的服务器进行速度测试期间

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

速度测试完成后直接。

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
networking

2 个回答

  1. 根据http://www.cisco.com/web/partners/downloads/765/tools/quickreference/routerperformance.pdf

    1721 的峰值吞吐量能力为每秒 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，小数据包大约减半。数据表显示 CEF 性能为 6.14Mbit/s。

    1721 旨在以 T1 速度处理数据。

    • 2
  2. Best Answer

    好的，我连接了两台机器：一台连接到板载 FE 端口，另一台连接到 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不带 NVI 的 NAT。
    • 我运行 iPerf 3 次，平均速度为 9.31 Mbps。
    • 我关闭了 NAT，再次尝试，平均结果差不多。

    然后我再次查看了演出版本并注意到了。

    1 Ethernet interface
5 FastEthernet interfaces

    由于板上只有一个 FE，而 WIC-4ESW 有四个，我想知道另一个以太网接口是从哪里来的。

    经过一番研究，打开板载 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 CPU 的链接。路由器性能指南中没有提到，但深埋在 Cisco 网站上的配置指南中。

    所以是的...... 1721 将始终被限制（路由）到 CPU 的 10Mbps（全双工）链接。

    • 1

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