Soft-Reconfiguration-Inbound

Scenario to verify BGP peer-group address-family ipv6-unicast soft-reconfiguration inbound inheritance. When soft-reconfiguration inbound is configured on a peer-group under address-family ipv6-unicast, members store all received IPv6 routes before applying inbound policies. This allows viewing original routes via received-routes even if they were filtered.

Test iBGP IPv6 - Peer-group soft-reconfiguration inbound stores routes before filtering

Description

Test that soft-reconfiguration inbound configured on a peer-group under address-family ipv6-unicast stores received routes before policy filtering. DUT1 advertises 2001:db8:10::/64 and 2001:db8:20::/64. DUT0’s route-map only permits 2001:db8:10::/64. With soft-reconfiguration inbound inherited from the peer-group, 2001:db8:20::/64 is filtered from the BGP table but still visible in received-routes.

Scenario

Step 1: Set the following configuration in DUT0 :

set interfaces ethernet eth0 address '2001:db8:1::100/64'
set protocols bgp 20 neighbor peer address-family ipv6-unicast activate
set protocols bgp 20 neighbor peer peer-group MYGROUP
set protocols bgp 20 neighbor peer remote-address '2001:db8:1::200'
set protocols bgp 20 neighbor peer remote-as 20
set protocols bgp 20 parameters router-id 1.1.1.100
set protocols bgp 20 peer-group MYGROUP address-family ipv6-unicast route-map import FILTER-IN
set protocols bgp 20 peer-group MYGROUP address-family ipv6-unicast soft-reconfiguration inbound
set protocols bgp 20 peer-group MYGROUP remote-as 20
set protocols ipv6 prefix-list IMPORT-FILTER rule 10 action permit
set protocols ipv6 prefix-list IMPORT-FILTER rule 10 prefix '2001:db8:10::/64'
set protocols route-map FILTER-IN rule 10 action permit
set protocols route-map FILTER-IN rule 10 match ipv6 address prefix-list IMPORT-FILTER
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'

Step 2: Set the following configuration in DUT1 :

set interfaces dummy dum0 address '2001:db8:10::1/64'
set interfaces dummy dum1 address '2001:db8:20::1/64'
set interfaces ethernet eth0 address '2001:db8:1::200/64'
set protocols bgp 20 address-family ipv6-unicast redistribute connected
set protocols bgp 20 neighbor peer address-family ipv6-unicast activate
set protocols bgp 20 neighbor peer remote-address '2001:db8:1::100'
set protocols bgp 20 neighbor peer remote-as 20
set protocols bgp 20 parameters router-id 1.1.1.200
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'

Attention

Verify iBGP session establishes.

Step 3: Run command protocols bgp show ipv6 summary at DUT0 and check if output matches the following regular expressions:

2001:db8:1::200.*Established
Show output
IPv6 Unicast Summary:
BGP router identifier 1.1.1.100, local AS number 20 VRF default vrf-id 0
BGP table version 0
RIB entries 0, using 0 bytes of memory
Peers 1, using 24 KiB of memory
Peer groups 1, using 64 bytes of memory

Neighbor        LocalAddr       V         AS   MsgRcvd   MsgSent   TblVer  InQ OutQ  Up/Down        State   PfxRcd   PfxSnt Desc
2001:db8:1::200 0.0.0.0         4         20         2         2        0    0    0 00:00:00  Established        0        0 FRRouting/10.4.1

Total number of neighbors 1

Attention

Verify DUT0 accepts only 2001:db8:10::/64 (permitted by filter).

Step 4: Run command protocols bgp show ipv6 at DUT0 and check if output matches the following regular expressions:

2001:db8:10::/64
Show output
BGP table version is 1, local router ID is 1.1.1.100, vrf id 0
Default local pref 100, local AS 20
local address -
Status codes:  s suppressed, d damped, h history, u unsorted, * valid, > best, = multipath,
               i internal, r RIB-failure, S Stale, R Removed
Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self
Origin codes:  i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

     Network          Next Hop            Metric LocPrf Weight Path
 *>i 2001:db8:10::/64 fe80::dcad:beff:feef:6c10
                                             0    100      0 ?

Displayed 1 routes and 1 total paths

Attention

Verify soft-reconfiguration stores all received routes.

Step 5: Run command protocols bgp show ipv6 neighbors neighbor peer received-routes at DUT0 and check if output matches the following regular expressions:

2001:db8:10::/64 [\s\S]*2001:db8:20::/64
Show output
BGP table version is 1, local router ID is 1.1.1.100, vrf id 0
Default local pref 100, local AS 20
local address (null)
Status codes:  s suppressed, d damped, h history, u unsorted, * valid, > best, = multipath,
               i internal, r RIB-failure, S Stale, R Removed
Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self
Origin codes:  i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

     Network          Next Hop            Metric LocPrf Weight Path
 *> 2001:db8:1::/64  2001:db8:1::200          0    100      0 ?
 *> 2001:db8:10::/64 2001:db8:1::200          0    100      0 ?
 *> 2001:db8:20::/64 2001:db8:1::200          0    100      0 ?

Total number of prefixes 3 (2 filtered)