华为S2350P-EI交换机的配置问题。很急啊！！！

我从配置号的交换机上用display current-configuration命令获取配置为：
#
vlan batch 1 192 1492 to 1497
#
cluster enable
ntdp enable
ntdp hop 16
ndp enable
#
voice-vlan mac-address 0001-e300-0000 mask ffff-ff00-0000 description Siemens p
hone
voice-vlan mac-address 0003-6b00-0000 mask ffff-ff00-0000 description Cisco pho
ne
voice-vlan mac-address 0004-0d00-0000 mask ffff-ff00-0000 description Avaya pho
ne
voice-vlan mac-address 0060-b900-0000 mask ffff-ff00-0000 description Philips/N
EC phone
voice-vlan mac-address 00d0-1e00-0000 mask ffff-ff00-0000 description Pingtel p
hone
voice-vlan mac-address 00e0-7500-0000 mask ffff-ff00-0000 description Polycom p
hone
voice-vlan mac-address 00e0-bb00-0000 mask ffff-ff00-0000 description 3com phon
e
#
undo http server enable
#
interface Vlanif1
ip address dhcp-alloc
#
interface Vlanif192
ip address 172.16.0.115 255.255.252.0
#
interface Ethernet0/0/1
port link-type trunk
port trunk allow-pass vlan 192 1456 to 1461 1492 to 1497
loopback-detect enable
bpdu enable
ntdp enable
ndp enable
#
interface Ethernet0/0/2
port default vlan 1492
loopback-detect enable
bpdu enable
ntdp enable
ndp enable
……………………
#
aaa
authentication-scheme default
authorization-scheme default
accounting-scheme default
domain default
domain default_admin
local-user huawei password cipher N`C55QK<`=/Q=^Q`MAF4<1!!
local-user huawei level 3
local-user huawei ftp-directory flash:
local-user huawei service-type telnet
#
ip route-static 0.0.0.0 0.0.0.0 172.16.0.1
#
snmp-agent
snmp-agent local-engineid 000007DB7F00000100003B1D
snmp-agent community read XXXXXX
snmp-agent sys-info contact Huawei-Tel:8008302118
snmp-agent sys-info version all
snmp-agent target-host trap address udp-domain 172.16.255.2 params securityname
shiyuan
snmp-agent target-host trap address udp-domain 172.16.255.3 params securityname
shiyuan
snmp-agent trap enable standard
#
user-interface con 0
user-interface vty 0 4
authentication-mode aaa
#
但是当我自己配置的时候，缺出现了以下问题：
1、写undo http server enable 的时候 找不到http命令
2、#
interface Vlanif1
ip address dhcp-alloc
配置完成之后，在配置以下的时候
#
interface Vlanif192
ip address 172.16.0.115 255.255.252.0
#
提示说超出了数量支持限额。
求高手帮助！！！！！！！！！！

原因是人家能配置上去，我为什么就不行呢？

掩码 255.255.252.0 有问题

写undo http server enable 的时候 找不到http命令
这是什么原因呢？