04-14-2018 11:13 PM - edited 03-05-2019 10:16 AM
Hello.
I am receiving alerts from a BGP circuit directly connected to the SP but when i check BGP summary I get this:
R1#sh ip bgp sum | inc N|10.1.1.1
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
10.1.1.1 4 65534 0 0 1 0 0 never Active
R1#!--------------------------------------------------------------------
R1#sh ip route 10.1.1.1
Routing entry for 10.1.1.1/30
Known via "connected", distance 0, metric 0 (connected, via interface)
Routing Descriptor Blocks:
* directly connected, via GigabitEthernet0/1/1.260
Route metric is 0, traffic share count is 1
R1#!--------------------------------------------------------------------
R1#sh int GigabitEthernet0/1/1.260 | inc GigabitEthernet0/1/1.260 |Har|Int|Des|MTU|rel
GigabitEthernet0/1/1.260 is up, line protocol is up
Hardware is SPA-8X1GE-V2, address is ccef.cccc.bbbb (bia ccef.cccc.bbbb)
Description: -xxxxx
Internet address is 10.1.1.1/30
MTU 1500 bytes, BW 150000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
And there is nothing in the logs:
R1#sh log | inc Apr 15(.+)BGP(.+)10.1.1.1
R1#sh log | inc Apr 14(.+)BGP(.+)10.1.1.1
R1#
The never entry under Up/Down section means that the BGP session has never ever been active? The interface is transmitting and receiving packets, and the alerts are increasing, so I am a bit confused.
GigabitEthernet0/1/1 is up, line protocol is up
Hardware is SPA-8X1GE-V2, address is ccef.cccc.bbbb (bia ccef.cccc.bbbb)
Description: xxxxx
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation 802.1Q Virtual LAN, Vlan ID 1., loopback not set
Keepalive not supported
Full Duplex, 1000Mbps, link type is force-up, media type is SX
output flow-control is on, input flow-control is on
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:01, output hang never
Last clearing of "show interface" counters 2w5d
Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 235844
Queueing strategy: Class-based queueing
Output queue: 0/40 (size/max)
5 minute input rate 21000 bits/sec, 27 packets/sec
5 minute output rate 44000 bits/sec, 29 packets/sec
1693423893 packets input, 169097014695 bytes, 0 no buffer
Received 27070 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 3575951 multicast, 0 pause input
1830351220 packets output, 664865214336 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
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
Thank you
Solved! Go to Solution.
04-15-2018 04:14 PM - edited 04-15-2018 04:16 PM
If it was up at one point and then lost peering, in that situation "state" should change to idle and under "up/down" should reflect how long it's been down for and not say "never".
04-15-2018 05:45 AM
Router in question is actively trying to establish bgp peering with its neighbor and currently there is no bgp neighbor on that link.
Normal output would be like this:
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
10.10.10.1 4 100 7 6 2 0 0 00:02:24 1
Are you able to ping neighbor's remote address? Can you share bgp configuration?
04-15-2018 08:44 AM
I was not able to ping the peer. Unfortunately i cannot trace back to that incident at the moment, as I changed real device name, circuit ID and public IP address when posting details here.
I am more concerned about that "never" keyword under Up/Down section. Does it simply mean that the BGP session has never been established? Or is it not so straightforward?
04-15-2018 04:14 PM - edited 04-15-2018 04:16 PM
If it was up at one point and then lost peering, in that situation "state" should change to idle and under "up/down" should reflect how long it's been down for and not say "never".
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