telnet卡住问题求助

初电

我这边有一台路由器从部分地方telnet会出现如下现象无法telnet上去。有些地方可以成功telnet有些地方则不行，我telnet到他相连的交换机上telnet过去也不行。show user 查看也没有多的用户，ping都可以通，acl也没看到有什么策略。请问发生这样的问题，应该如何排查？可能会有什么原因产生？

                               
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路由器開啟Telnet Debug  得到屏顯如下：

NG的：

*Dec 21 12:11:54.147 UTC: Telnet514: 1 1 251 1

*Dec 21 12:11:54.147 UTC: TCP514: Telnet sent WILL ECHO (1)

*Dec 21 12:11:54.147 UTC: Telnet514: 2 2 251 3

*Dec 21 12:11:54.147 UTC: TCP514: Telnet sent WILL SUPPRESS-GA (3)

*Dec 21 12:11:54.147 UTC: Telnet514: 80000 80000 253 24

*Dec 21 12:11:54.147 UTC: TCP514: Telnet sent DO TTY-TYPE (24)

*Dec 21 12:11:54.147 UTC: Telnet514: 10000000 10000000 253 31

*Dec 21 12:11:54.147 UTC: TCP514: Telnet sent DO WINDOW-SIZE (31)

OK的：

*Dec 21 12:00:24.791 UTC: Telnet514: 1 1 251 1

*Dec 21 12:00:24.791 UTC: TCP514: Telnet sent WILL ECHO (1)

*Dec 21 12:00:24.791 UTC: Telnet514: 2 2 251 3

*Dec 21 12:00:24.791 UTC: TCP514: Telnet sent WILL SUPPRESS-GA (3)

*Dec 21 12:00:24.791 UTC: Telnet514: 80000 80000 253 24

*Dec 21 12:00:24.791 UTC: TCP514: Telnet sent DO TTY-TYPE (24)

*Dec 21 12:00:24.791 UTC: Telnet514: 10000000 10000000 253 31

*Dec 21 12:00:24.791 UTC: TCP514: Telnet sent DO WINDOW-SIZE (31)

*Dec 21 12:00:24.795 UTC: TCP514: Telnet received DO SUPPRESS-GA (3)

*Dec 21 12:00:24.795 UTC: TCP514: Telnet received WILL TTY-TYPE (24)

*Dec 21 12:00:24.795 UTC: Telnet514: Sent SB 24 1

*Dec 21 12:00:24.799 UTC: TCP514: Telnet received DO ECHO (1)

*Dec 21 12:00:24.799 UTC: TCP514: Telnet received WILL WINDOW-SIZE (31)

*Dec 21 12:00:24.799 UTC: Telnet514: recv SB NAWS 132 54

*Dec 21 12:00:24.799 UTC: Telnet514: recv SB 24 0 vt100

下面是部分配置：
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 172.28.208.250
ip route 10.0.0.0 255.0.0.0 172.28.208.1
ip route 172.16.0.0 255.240.0.0 172.28.208.1
ip route 172.28.192.0 255.255.224.0 172.28.208.1
ip route 172.28.224.0 255.255.224.0 172.28.208.1
!
!
ip http server
ip http timeout-policy idle 60 life 86400 requests 10000
ip nat inside source list 1 interface GigabitEthernet0/1 overload
ip nat inside source static tcp 172.28.230.133 1010 218.4.61.90 1010 extendable
!
access-list 1 permit 172.28.230.0 0.0.0.255
snmp-server community public RO
route-map HuaTeng permit 10
match ip address 1
set ip next-hop 218.4.61.89
!
!
!
control-plane
!
!
line con 0
password 7 045802150C2E
login   
line aux 0
line vty 0 4
password 7 05080F1C2243
logging synchronous
login
transport input telnet
line vty 5 15
privilege level 15
password 7 060506324F41
login local
transport input telnet
!

michael_kui

有的老交换机就是这样的，和其他厂家的有点不兼容。

初电

图片没上去，telnet后的现象是这个