05-18-2007 02:25 AM - edited 03-03-2019 05:02 PM
Hi, just a little confusion..
when i run the comand "show ip interface brief"
i get the output ..
Router#sh ip int brief
Interface IP-Address OK? Method Status Proocol
FastEthernet0/0 92.168.26.251 YES NVRAM up down
FastEthernet0/1 192.168.4.254 YES NVRAM up up
now the funny thing is that i done have any cable connected to the interface Fe0/0
shouldnt the status be showing "down" ???
cause if i shut it don then it shows administratively shutdown.. i theres a cable connected to it then status shows up..
any help.. ?
the router is 2801 with IOS version 12.4
Solved! Go to Solution.
05-18-2007 02:41 AM
Friend,
The fast ethernet interface will never show the interface as down after you do a no shut to the interface.
It does not rely on any carrier detects as in serial interfaces and hence displays this behavior. This is independent of the platform and not specific to 2801
HTH, rate if it does
Narayan
05-18-2007 02:31 AM
Hi Shaukat,
Can you paste the output of "sh run int fa0/0" and "sh run int fa0/1" ?
Regards,
Ankur
05-18-2007 02:41 AM
Friend,
The fast ethernet interface will never show the interface as down after you do a no shut to the interface.
It does not rely on any carrier detects as in serial interfaces and hence displays this behavior. This is independent of the platform and not specific to 2801
HTH, rate if it does
Narayan
05-18-2007 03:08 AM
Hi Shaukat,
I believe Narayn explained you the reason. I did not read your question completely and thaught you are asking fa1/1 is up and up without anything connected and that is the reason I asked the outputs. You can ignore my post.
What you are observing is expected behavior.
Regards,
Ankur
05-18-2007 03:18 AM
Hi,
Narayan has explained it perfectly, only one thing to add, always make sure that keepalives is set under the Ethernet interface, in order to reflect the real state of the interface.
HTH, please do rate all helpful replies,
Mohammed Mahmoud.
05-18-2007 05:08 AM
So u mean to say that the FastEthernet interfaces will never show its status as down unless the interface is shutdown administratively. ??????
meaning that these interfaces (when no shut) will always be up regardless if any cable is inerted into it or not...
is there any cisco's word on this regards ?? cause im having a point of conflict with an ISP's tech support...
thanks for the support..
heres my interfaces info too...
Router#sh ip int fastEthernet 0/0
FastEthernet0/0 is up, line protocol is down
Internet address is 192.168.26.251/24
Broadcast address is 255.255.255.255
Address determined by non-volatile memory
MTU is 1500 bytes
Helper address is not set
Directed broadcast forwarding is disabled
Multicast reserved groups joined: 224.0.0.9
Outgoing access list is not set
Inbound access list is not set
Proxy ARP is enabled
Local Proxy ARP is disabled
Security level is default
Split horizon is enabled
ICMP redirects are always sent
ICMP unreachables are always sent
ICMP mask replies are never sent
IP fast switching is enabled
IP fast switching on the same interface is disabled
IP Flow switching is enabled
IP CEF switching is enabled
IP CEF Flow Fast switching turbo vector
IP multicast fast switching is enabled
IP multicast distributed fast switching is disabled
IP route-cache flags are Fast, Flow cache, CEF, Full Flow
Router Discovery is disabled
IP output packet accounting is disabled
IP access violation accounting is disabled
TCP/IP header compression is disabled
RTP/IP header compression is disabled
Policy routing is disabled
Network address translation is disabled
BGP Policy Mapping is disabled
WCCP Redirect outbound is disabled
WCCP Redirect inbound is disabled
WCCP Redirect exclude is disabled
05-18-2007 05:16 AM
Yes,
FastEthernet interfaces will never show its interface status as down after a no shut.
The line protocol will be down if for eg there is mismatch in the cable cross vs straight
I could not find a document regarding the same in CCO
HTH, rate if it does
Narayan
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