MSR系列路由器和中兴路由器做帧中继时,物理和协议up但无法ping通的案例
一、 组网:
二、 问题描述:
如上图所示,MSR路由器和中兴路由器通过帧中继网络互联,两端路由器接口上封装的帧中继协议,用display interface查看两端接口物理和协议都up,但是配置上同一网段的ip地址和map映射后,发现仍ping不通对端的地址。
三、 过程分析:
查看两端的配置
MSR侧:
interface Serial5/0
link-protocol fr
fr interface-type dce
fr map ip 26.96.2.78 100
fr dlci 100
ip address 26.96.2.73 255.255.255.248
查看MSR侧接口的状态:
Serial5/0 current state: UP
Line protocol current state: UP
Description: to YBYGPU
The Maximum Transmit Unit is 1500, Hold timer is 10(sec)
Physical layer is E1-F, baudrate is 1984000 bps
fe1 timeslot-list 1-31
Internet Address is 26.96.2.73/29 Primary
Link layer protocol is FR IETF
LMI DLCI is 0, LMI type is Q.933a, frame relay DCE
LMI status enquiry received 330, LMI status sent 330
LMI status enquiry timeout 53, LMI message discarded 6
Output queue : (Urgent queuing : Size/Length/Discards) 0/100/0
Output queue : (Protocol queuing : Size/Length/Discards) 0/500/0
Output queue : (FIFO queuing : Size/Length/Discards) 0/75/0
Last clearing of counters: Never
Last 300 seconds input rate 577.27 bytes/sec, 4618 bits/sec, 8.31 packets/sec
Last 300 seconds output rate 179.96 bytes/sec, 1439 bits/sec, 2.68 packets/sec
中兴侧:
interface ce1_3/1.1
ip address 26.96.2.78 255.255.255
encapsulation frame-relay
frame-relay interface-dlci 100
查看中兴侧接口状态
SHOW INT ce1_3/1.1
ce1_3/1.1 is up, line protocol is up
Description is none
Keepalive set:10 sec
The port is electric
crc 16
Internet address is 26.96.2.78/29
MTU 1500 bytes
MRU 1500 bytes BW 1984 Kbits
Sample rate is 0
Encapsulation frame-relay,
LAPB state:Disconnected State
Last clearing of "show interface" counters never
120 seconds input rate: 355 Bps, 4 pps
120 seconds output rate: 1006 Bps, 12 pps
Interface peak rate : input 81111 Bps, output 3527 Bps
Interface utilization: input 0%, output 0%
Input:
Packets : 152832 Bytes: 167098008
Output:
Packets : 197572 Bytes: 14103152
从接口的信息和配置来看,中兴端路由器用的是子接口的形式和本端建立的帧中继,而从中兴工程师获知,中兴路由器的子接口默认是点到点的类型(MSR默认的是点到多点的类型)
四、 解决方法:
因为中兴侧路由器帧中继点到点的类型不能配置静态和动态映射,所以将MSR侧也配置子接口并且将子接口封装成p2p的类型,在子接口上配置和中兴侧路由器子接口的dlci号一致;或者将中兴侧的子接口封装成p2mp的类型。
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