BGP state of down sessions is only IDLE (I don't see Active-state)...
Down BGP sessions stay in only IDLE state by command : sh ip bgp summary. The router knows the path to the neighbor. For example:
80.81.192.A 4 2528B 0 0 0 0 0 01:31:26 Idle
Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 22.214.171.124, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5)
I don't see them as Active and it is strange to me... Could you explain it?
#sh ver Cisco IOS Software, c7600s72033_rp Software (c7600s72033_rp-ADVIPSERVICES-M), Version 12.2(33)SRD1, RELEASE SOFTWARE (fc4) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2009 by Cisco Systems, Inc. Compiled Tue 24-Feb-09 23:34 by prod_rel_team
ROM: System Bootstrap, Version 12.2(17r)S4, RELEASE SOFTWARE (fc1) BOOTLDR: Cisco IOS Software, c7600s72033_rp Software (c7600s72033_rp-ADVIPSERVICES-M), Version 12.2(33)SRD1, RELEASE SOFTWARE (fc4)
Router01 uptime is 26 weeks, 1 day, 15 hours, 34 minutes Uptime for this control processor is 26 weeks, 1 day, 15 hours, 47 minutes System returned to ROM by reload at 15:34:25 UTC Tue Feb 24 2009 (SP by reload) System restarted at 17:05:40 UTC Tue Jul 28 2009 System image file is "bootdisk:c7600s72033-advipservices-mz.122-33.SRD1.bin" Last reload type: Normal Reload
cisco CISCO7609 (R7000) processor (revision 1.2) with 983008K/65536K bytes of memory. Processor board ID FOX103107NH SR71000 CPU at 600Mhz, Implementation 0x504, Rev 1.2, 512KB L2 Cache Last reset from s/w reset 5 Virtual Ethernet interfaces 100 Gigabit Ethernet interfaces 12 Ten Gigabit Ethernet interfaces 1917K bytes of non-volatile configuration memory. 8192K bytes of packet buffer memory.
65536K bytes of Flash internal SIMM (Sector size 512K). Configuration register is 0x2102
Re: BGP state of down sessions is only IDLE (I don't see Active-
no wrong again
it is direct eBGP peering 80.81.192.C (our ip on DECIX) and 80.81.192.B(remote-AS).
I know that session is exist on remote side, but it down (because of leak of prefixes from my AS).
anyway it should be most time in Active state and just a few seconds in Idle state, at least it was on another models/IOS.
#sh ip bgp neighbor 80.81.192.A BGP neighbor is 80.81.192.A, remote AS B, external link Description: C BGP version 4, remote router ID 80.81.192.A BGP state = OpenSent Last read 00:00:00, last write 00:00:00, hold time is 180, keepalive interval is 60 seconds Neighbor sessions: 0 active, is multisession capable Message statistics, flags active, state OpenSent: InQ depth is 2 OutQ depth is 0
Sent Rcvd Opens: 1 0 Notifications: 0 0 Updates: 0 0 Keepalives: 0 0 Route Refresh: 0 0 Total: 1 0 Default minimum time between advertisement runs is 30 seconds
For address family: IPv4 Unicast Session: 80.81.192.A active BGP table version 73660861, neighbor version 0/0 Output queue size : 0 Index 2, Offset 0, Mask 0x4 2 update-group member Inbound soft reconfiguration allowed NEXT_HOP is always this router Inbound path policy configured Outbound path policy configured Route map for incoming advertisements is DE-PEER-DECIX-in Route map for outgoing advertisements is DE-PEER-DECIX-out Sent Rcvd Prefix activity: ---- ---- Prefixes Current: 155 0 Prefixes Total: 0 0 Implicit Withdraw: 0 0 Explicit Withdraw: 0 0 Used as bestpath: n/a 0 Used as multipath: n/a 0
Outbound Inbound Local Policy Denied Prefixes: -------- ------- Total: 0 0 Maximum prefixes allowed 3000 Threshold for warning message 75% Number of NLRIs in the update sent: max 625, min 0
Address tracking is enabled, the RIB does have a route to 80.81.192.A Connections established 10; dropped 10 Last reset 00:41:55, due to NSF peer closed the session of session 1 Transport(tcp) path-mtu-discovery is enabled Graceful-Restart is enabled, restart-time 120 seconds, stalepath-time 360 seconds No active TCP connection
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