Connectivity Guide

View fast external fallover unconguration
OS10(config-router-bgp-300)# do show running-configuration bgp
!
router bgp 300
no fast-external-fallover
!
neighbor 3.1.1.1
remote-as 100
no shutdown
!
neighbor 3::1
remote-as 100
no shutdown
!
address-family ipv6 unicast
activate
OS10(config-router-bgp-300)#
OS10(conf-if-eth1/1/1)# do clear ip bgp *
OS10# show ip bgp summary
BGP router identifier 11.11.11.11 local AS number 300
Neighbor AS MsgRcvd MsgSent Up/Down State/Pfx
-----------------------------------------------------------------
3.1.1.1 100 7 4 00:00:08 3
3::1 100 9 5 00:00:08 4
OS10#
OS10(config)# interface ethernet 1/1/1
OS10(conf-if-eth1/1/1)# shutdown
OS10(conf-if-eth1/1/1)# do show ip bgp summary
BGP router identifier 11.11.11.11 local AS number 300
Neighbor AS MsgRcvd MsgSent Up/Down State/Pfx
-----------------------------------------------------------------
3.1.1.1 100 7 4 00:00:29 3
3::1 100 9 5 00:00:29 4
OS10(conf-if-eth1/1/1)#
OS10(config-router-bgp-neighbor-af)# Apr 27 01:39:03 OS10 dn_sm[2065]: Node.1-Unit.1:PRI:alert
[os10:event],
%Dell EMC (OS10) %BGP_NBR_BKWD_STATE_CHG: Backward state change occurred Hold Time expired for
Nbr:3.1.1.3 VRF:default
Apr 27 01:39:03 OS10 dn_sm[2065]: Node.1-Unit.1:PRI:alert [os10:event], %Dell EMC (OS10)
%BGP_NBR_BKWD_STATE_CHG: Backward
state change occurred Hold Time expired for Nbr:3::3 VRF:default
Passive peering
When you enable a peer-template, the system sends an OPEN message to initiate a TCP connection. If you enable passive peering for the
peer template, the system does not send an OPEN message but responds to an OPEN message.
When a BGP neighbor connection with authentication rejects a passive peer-template, the system prevents another passive peer-template
on the same subnet from connecting with the BGP neighbor. To work around this constraint, change the BGP conguration or change the
order of the peer template conguration.
You can restrict the number of passive sessions the neighbor accepts using the limit command.
1 Enable BGP and assign the AS number to the local BGP speaker in CONFIGURATION mode (1 to 65535 for 2-byte, 1 to 4294967295
for 4-byte).
router bgp as-number
2 Congure a template that does not initiate TCP connections with other peers in ROUTER-BGP mode. A maximum of 16 characters.
template template-name
3 Create and enter the AS number for the remote neighbor in ROUTER-BGP-TEMPLATE mode (1 to 4294967295).
remote-as as-number
Layer 3
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