Hi, i have a 3750G Stack with iBGP enabled. Routing works fine, but there is no answer from this Switch if the TTL=0. e.g. if i traceroute over this switch. With Linux or Windows its the same effect (traceroute udp/icmp). There are about 1000 routes learned by BGP. CPU is 14 %. What can it be.
Thanks a.user
If the packet received by a device has a TTL = zero it must discard the packet and it may or may not send an ICMP packet ( i.e it is okay to silently discard).
it seems the switch discard silently, but why. Is there an option, i can force to send ICMP TTL time exceede? With mtr i have about 80% packet lost on this hop, all other hops has 0% packet lost.
There is probably nothing thant can be done.
Why are the traceroute packets being send with TTL= 0 ???
Post toutput for:
show version
sh ip interface
sh run interface
Can you post SVI configuration? If there is "no ip unreachables" that would be the answer.
Regards, Andrey.
indeed there is "no ip redirects" configured on SVI, that enables icmp messages. I enabled ip redirects, but no effects. ip unreachables was enabled. regards a.user
Merv schrieb:
2 3750 in a Stack.C3750-IPSERVICESK9-M), Version 12.2(35)SE2
GigabitEthernet1/0/24 is up, line protocol is up (connected) Hardware is Gigabit Ethernet, address is 001b.5392.1d98 (bia
001b.5392.1d98) Description: CE1_main MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, reliability 255/255, txload 3/255, rxload 3/255 Encapsulation ARPA, loopback not set Keepalive set (10 sec) Full-duplex, 1000Mb/s, media type is 10/100/1000BaseTX Media-type configured as connector input flow-control is off, output flow-control is unsupported ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:24, output 00:00:04, output hang never Last clearing of "show interface" counters never 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 13674000 bits/sec, 3548 packets/sec 5 minute output rate 13583000 bits/sec, 2313 packets/sec 82460951604 packets input, 27395949469315 bytes, 0 no buffer Received 537419 broadcasts (0 multicasts) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 218891 multicast, 0 pause input 0 input packets with dribble condition detected 55306780192 packets output, 54191595455625 bytes, 0 underruns 0 output errors, 0 collisions, 4 interface resets 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier, 0 PAUSE output 0 output buffer failures, 0 output buffers swapped out GigabitEthernet2/0/24 is up, line protocol is up (connected) Hardware is Gigabit Ethernet, address is 001b.53d1.a898 (bia 001b.53d1.a898) Description: CE2_main MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive set (10 sec) Full-duplex, 1000Mb/s, media type is 10/100/1000BaseTX Media-type configured as connector input flow-control is off, output flow-control is unsupported ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:47, output 00:00:00, output hang never Last clearing of "show interface" counters never 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 87000 bits/sec, 10 packets/sec 5 minute output rate 6637000 bits/sec, 1228 packets/sec 2054239383 packets input, 1608112747890 bytes, 0 no buffer Received 537368 broadcasts (0 multicasts) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 218894 multicast, 0 pause input 0 input packets with dribble condition detected 42813921870 packets output, 39026119571497 bytes, 0 underruns 0 output errors, 0 collisions, 2 interface resets 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier, 0 PAUSE output 0 output buffer failures, 0 output buffers swapped outinterface GigabitEthernet1/0/24 description CE1_main switchport access vlan 41 switchport mode access spanning-tree bpduguard disable end
interface GigabitEthernet2/0/24 description CE2_main switchport access vlan 41 switchport mode access spanning-tree bpduguard disable end
interface Vlan41 description Transport-main ip address 10.2.7.66 255.255.255.240 no ip redirects standby 10 ip 10.2.7.65 standby 10 priority 150 end
check if icmp unreachables has been disabled on interface vlan 41
show ip interface vlan 41
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