In my configuration we have BGP peering with ISP and we have configured route-map to mach particular routes to be learnt from ISP on inward direction.
We are planning to update the route-map but for changes to get into effect i need to perform soft reset but i am not sure where dynamic soft reset is capable or not. Below is the "sh ip bgp neighbor" output.
Please note there is not "neighbor soft-reconfigurationinbound" configured on the switch.
Edge_switch_C6509#sh ip bgp neighbors 10.x.x.x BGP neighbor is 10.x.x.x, remote AS xxxxx, external link Member of peer-group toxxxxx for session parameters BGP version 4, remote router ID 10.x.x.x BGP state = Established, up for 32w2d Last read 00:00:01, last write 00:00:02, hold time is 15, keepalive interval is 5 seconds Configured hold time is 15, keepalive interval is 5 seconds Neighbor capabilities: Route refresh: advertised and received(new) Address family IPv4 Unicast: advertised and received Message statistics: InQ depth is 0 OutQ depth is 0 Sent Rcvd Opens: 2 2 Notifications: 0 0 Updates: 7909 3640 Keepalives: 9264100 9045990 Route Refresh: 0 0 Total: 9272011 9049632 Default minimum time between advertisement runs is 30 seconds
For address family: IPv4 Unicast BGP table version 88049, neighbor version 88049/0 Output queue size : 0 Index 4, Offset 0, Mask 0x10 4 update-group member to65000 peer-group member Private AS number removed from updates to this neighbor Inbound path policy configured Route map for incoming advertisements is Route_From_ISP Sent Rcvd Prefix activity: ---- ---- Prefixes Current: 614 3 (Consumes 144 bytes) Prefixes Total: 5778 108 Implicit Withdraw: 3630 105 Explicit Withdraw: 1739 0 Used as bestpath: n/a 0 Used as multipath: n/a 3
Outbound Inbound Local Policy Denied Prefixes: -------- ------- route-map: 0 33848 AS_PATH loop: n/a 5797 Bestpath from this peer: 13 n/a Suppressed due to dampening: 5 n/a Total: 18 39645 Number of NLRIs in the update sent: max 285, min 0
Connections established 2; dropped 1 Last reset 32w2d, due to Peer closed the session Connection state is ESTAB, I/O status: 1, unread input bytes: 0 Local host: 10.2.249.9, Local port: 179 Foreign host: 10.2.249.10, Foreign port: 28117
SRTT: 300 ms, RTTO: 303 ms, RTV: 3 ms, KRTT: 0 ms minRTT: 0 ms, maxRTT: 348 ms, ACK hold: 200 ms Flags: passive open, retransmission timeout, nagle, gen tcbs
Datagrams (max data segment is 1460 bytes): Rcvd: 7591197 (out of order: 0), with data: 3822932, total data bytes: 73102146 Sent: 7451321 (retransmit: 185), with data: 3918523, total data bytes: 74617753
Since show ip bgp nei lists "Route refresh: advertised and received(new)"then you can do a soft reset without affecting the BGP session. This capability gives the ability to request or/and send new advertisement after applying a route policy without the need to tear down BGP session.
The pre-requirement for executing the "clear ip bgp neighbor" is to have this configured "neightbor re-configuration inbound". But my switch do not have this configured so i am planning to configure it first to allow me to perform soft reset. I have another concern where my switch currently running on avarage of 80% memeory utilistation. Wondering what will the consiquence of adding more memory consuming configuration.
soft-reconfiguration inbound and route refresh capabilities are two different things. They are not dependent on each other. soft-reconfiguration inbound is used in cases where route refresh capabilities are not supported "this is rarely the case any more". That command is not necessary in fact, should be avoided if you're having memory starvation or just carry full routes unless you're troubleshooting filters.
With the soft-reconfiguration inbound, your router keeps two copies of the bgp table, one with the filters applied and another with full unedited copy. Your router supports router refresh, no need for soft-reconfiguration command.
As i told on my answer, soft reconfiguration i snot needed in order to clear bgp session without tearing down since route refresh is enables (and it is from the output you provided). In addition soft reconfiguration besides it is useless, it will rise the memory you use because it keeps two copies of routing table.
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