先说组网 S2600---V35光猫--------PDH光端机---E1----SDH-----省总行路由器（思科型号未知）

全程开通后，业务不通，本地S2600设备物理接口UP，协议接口DOWN，从V35光猫向省行侧环回，省行可以看到环回，而向S2600环回，看不到环回，V35光猫、连接线缆、S2600路由器均更换过，基本可以排除硬件问题。由于本人不熟悉S2600配置，因此怀疑是S2600配置问题。


1、据总行客户反映，V35业务使用HDLC封装，V35是非帧，2M带宽。地市侧S3600无需配置其他信息，在serial 1/3口配置 一个iP 地址即可，查看running config 如下：只在serial1/3接口下存在一个IP地址：ip address 144.32.248.210 255.255.255.252
再无其他配置。
2、进入serial1/3接口查看端口信息如下：
erial1/3 is up, line protocol is down
Hardware is CD2430 in sync mode
Description: line
Internet address is 144.32.248.210/30
MTU 1500 bytes, [color=red]BW 128 Kbit,[/color] DLY 20000 usec,（高手说是带宽问题）
reliability 129/255, txload 1/255, rxload 1/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
Last input never, output 00:00:07, output hang never
Last clearing of "show interface" counters 00:11:25
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/1/32 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 96 kilobits/sec
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
628679 input errors, 0 CRC, 0 frame, 628679 overrun, 0 ignored, 0 abort
80 packets output, 2292 bytes, 80 underruns
80 output errors, 0 collisions, 23 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up

[color=red]上面可以看出封装没有问题，但是一个高手说是带宽只有128K，无法达到2048K，是这个原因，吗？如何解决？[/color]
3、高手又看了设备版本信息如下：
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-IPBASE-M), Version 12.3(6c), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2004 by cisco Systems, Inc.
Compiled Tue 20-Jul-04 05:24 by kellythw
Image text-base: 0x80008098, data-base: 0x80ED06CC
cisco 2611XM (MPC860P) processor (revision 0x400) with 126976K/4096K bytes of memory.
Processor board ID JPE08461048 (1510076213)
M860 processor: part number 5, mask 2
Bridging software.
X.25 software, Version 3.0.0.
2 FastEthernet/IEEE 802.3 interface(s)
2 Serial(sync/async) network interface(s)
[color=red]8 Low-speed serial(sync/async) network interface(s)
[/color]32K bytes of non-volatile configuration memory.
32768K bytes of processor board System flash (Read/Write)

如上红字部分，高手说因为是低速端口达不到2048K带宽所致，需要更换路由器，请问是否正确？谢谢！