网络规划如下:
G0/1下接三层。上行G0/0固定IP,G0/2接ADSL,默认路由走固定IP。备份 路由走ADSL。但是平时ADSL是空闲。所以做了PBR让某几台终端默认走ADSL。当ADSL故障后走固定IP。现在情况是当ADSL正常时,全部正常使用。但当ADSL拨号失败时,原来走ADSL的没有去走默认的路由表,而是继续转发往ADSL。
版本:15.4(3)M ipbase-k9
主要配置:
interface Dialer0
ip address negotiated
ip mtu 1492
ip nat outside
encapsulation ppp
ip tcp adjust-mss 1024
dialer pool 1
dialer-group 1
ppp pap sent-username 8888 password 7 1447425B5C547A
ppp ipcp dns request
no cdp enable
!
route-map byadsl permit 10
match ip address 110
set interface Dialer0
!
access-list 110 permit ip host 192.168.135 any
!
RT-In-C2911#show int d0
Dialer0 is up, line protocol is up (spoofing)
Hardware is Unknown
Internet address will be negotiated using IPCP
MTU 1500 bytes, BW 56 Kbit/sec, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, LCP Closed, loopback not set
Keepalive set (10 sec)
DTR is pulsed for 1 seconds on reset
Last input never, output never, output hang never
Last clearing of "show interface" counters 11:17:45
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
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 packets output, 0 bytes
debug信息:
*Jan 10 15:02:22.841: IP: s=192.168.135.2 (GigabitEthernet0/1), d=114.114.114.114, len 76, FIB policy match
*Jan 10 15:02:22.841: IP: s=192.168.135.2 (GigabitEthernet0/1), d=114.114.114.114, len 76, PBR Counted
*Jan 10 15:02:22.841: IP: s=192.168.135.2 (GigabitEthernet0/1), d=114.114.114.114, len 76, policy match
*Jan 10 15:02:22.841: IP: route map byadsl, item 10, permit
*Jan 10 15:02:22.841: IP: s=192.168.135.2 (GigabitEthernet0/1), d=114.114.114.114 (Dialer0), len 76, policy routed
*Jan 10 15:02:22.841: IP: GigabitEthernet0/1 to Dialer0 114.114.114.114
*Jan 10 15:02:24.325: IP: s=192.168.135.2 (GigabitEthernet0/1), d=61.128.128.68, len 62, FIB policy match
*Jan 10 15:02:24.325: IP: s=192.168.135.2 (GigabitEthernet0/1), d=61.128.128.68, len 62, PBR Counted
*Jan 10 15:02:24.325: IP: s=192.168.135.2 (GigabitEthernet0/1), d=114.114.114.114, len 62, FIB policy match
*Jan 10 15:02:24.325: IP: s=192.168.135.2 (GigabitEthernet0/1), d=114.114.114.114, len 62, PBR Counted
*Jan 10 15:02:24.325: IP: s=192.168.135.2 (GigabitEthernet0/1), d=61.128.128.68, len 62, policy match
*Jan 10 15:02:24.325: IP: route map byadsl, item 10, permit
*Jan 10 15:02:24.325: IP: s=192.168.135.2 (GigabitEthernet0/1), d=61.128.128.68 (Dialer0), len 62, policy routed
*Jan 10 15:02:24.325: IP: GigabitEthernet0/1 to Dialer0 61.128.128.68