Tftp output

[pavan.kumar]

Hi,

Daily i take back of IOS from all my access and gateway routers. Below is the output from my gateway when i do tftp :

Address or name of remote host []? 192.168.14.12

Destination filename [hydgw-confg]? hydgw-run-config-30th-jul04

!!!.!!!.!!.!!!.!!.!!!.!!.!!

56767 bytes copied in 29.008 secs (1957 bytes/sec)

The output shows ,in between there are packet drops . wht does it mean and while upgrading my router also same output i found .Can any body explain the same .

Regds

VKSP

[spremkumar]

Hi

R u doing the tftp on the ethernet media means to the tftp server connected locally on the same switch wehre ur g/w router is connected??

if yes then its time to chek CRC,Collisions and u meant tht as a G/W router it would be connected to u r upstreams.may be cpu hoggin up due to BGP process or BGP flaps.

Just ping to u r PC or TFTP server where ur saving u r ios/configs and try to find out whether u r getting any drops in tht too..

Do chek whether any rate limit has been applied in ethernet to stop and use the B/W effectively from ur local lan..

if no and if u r doing using E1 links most probably the load factor on the E 1 link or again the error in tht E1 link may result in droppages.

while downloading i dont c any major issues,but make sure while upgrading the IOS image shuldnt be hving any error.

regds

prem

[pavan.kumar]

Hi Prem,

Yes you are right !! my tftp server and gateway router both connected to same LAN switch .

My GW router is doing BGP with only one Upstream provider.And there are no BGP flaps for the past 15days and also CPU process is very normal.

I will tell you about my access routers , I do take the Backup of the IOS config everyday from access routers .But i didn't find the same output from the Access Routers.

One more thing is Everyday in the morning time at 6AM IST we will take backup of IOS through tftp .SO we dont find much traffic at tht time ,if we talk about load.

Please clarify ,will there be any other root cause!!

Regds

VKSP

[Richard Burts]

If the router and the tftp server are connected to the same LAN switch then one possible explanation for the dropped packets would be a duplex mismatch between a device and the switch port to which it is connected (either the router and its switch port or the server and its switch port). If one end thinks it is full duplex and the other end thinks it is half duplex then the half duplex end device may be dropping packets because it thinks it has detected collisions. Check the setting of the switch ports and the device interfaces for the router and the server.

HTH

Rick

[pavan.kumar]

Hi Rick,

I didnt find any differences in the settings of (either the router and its switch port or the server and its switch port).

So any other possible reason.I will explain you the same once :

I have 3 routers All are cisco3660.

1 Router is Gateway .Remaining two are Access routers to which our customers got connected . I take backup everyday .But i'm not finding the same output from my access routers which i'm observing from my gateway router.

output from my gateway when i do tftp :

Address or name of remote host []? 192.168.14.12

Destination filename [hydgw-confg]? hydgw-run-config-30th-jul04

!!!.!!!.!!.!!!.!!.!!!.!!.!!

56767 bytes copied in 29.008 secs (1957 bytes/sec)

output from my Access Routers looks like this when i do tftp

!!!!!!!!!!!!!!!!!!!!

Please clarify :

Regds

Pavan

[Richard Burts]

I am not sure what I can clarify at this point. When you do tftp from your gateway router there is some packet loss and when you tftp from your access router there is not packet loss.

There are a number of things that might cause packet loss like this including: congestion (but you say that traffic levels are usually low when you are taking backup), duplex mismatch (but you say that you do not find any mismatch), overload on the server, packets got corrupted in transit, possibly a routing issue, or maybe other issues.

If you want to persue this further there is some information I would ask you to post. This would include information about the topology of the network. I believe you have said that the gateway router and the server are connected to the same LAN switch. Where are the access routers and how are they connected.

I would ask you to post the output of show port on the switch for the port connecting to the server, the port connecting to the gateway router, and if the access servers are connected to the switch then their ports also.

I would ask you to post the output of show interface for the interface on each router.

I would like to verify the data path to the server from each of the routers. So:

- if the gateway router includes the config command "ip tftp source-interface" then post the output of an extended trace with the destination the tftp server and the source whatever interface on the router is the tftp source. If you do not specify the tftp source interface then the output of a standard trace from the router to the server.

- if the access routers includes the config command "ip tftp source-interface" then post the output of an extended trace from each access router with the destination the tftp server and the source whatever interface on the router is the tftp source. If you do not specify the tftp source interface then the output of a standard trace from each router to the server.

HTH

Rick