← Everything's down: restore the network

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Objectives

Not met: The access trunk carries the required VLANs again
Not met: OSPF adjacencies are FULL and routes are present end to end
Not met: The ACL no longer blocks legitimate return traffic
Not met: A host at Site A can reach a host at Site B
Not met: A short note lists each fault found and the fix applied

# Incident notes
# Replace this with your write-up: one line per fault you found.
# For each: the layer, what was wrong, and the exact change you made.

hostname r-a
!
! Ethernet1: trunk to sw-a Ethernet2 (Site A access)
interface Ethernet1
   no shutdown
!
interface Ethernet1.110
   encapsulation dot1q vlan 110
   ip address 10.0.110.1/24
!
! Ethernet2: WAN link to r-b
interface Ethernet2
   ip address 10.0.99.1/30
!
router ospf 1
   network 10.0.110.0/24 area 0
   network 10.0.99.0/30 area 0
!
end

hostname r-b
!
! Ethernet1: WAN link to r-a
interface Ethernet1
   ip address 10.0.99.2/30
!
! Ethernet2: Site B LAN (host-b is 10.0.120.10)
interface Ethernet2
   ip address 10.0.120.1/24
   ip access-group SITE-B-IN in
!
ip access-list extended SITE-B-IN
   permit tcp 10.0.120.0 0.0.0.255 host 10.0.110.5 eq 22
!
router ospf 1
   network 10.0.99.0/30 area 1
   network 10.0.120.0/24 area 0
!
end

hostname sw-a
!
vlan 110
!
! Ethernet1: host-a (10.0.110.10, VLAN 110)
interface Ethernet1
   switchport mode access
   switchport access vlan 110
!
! Ethernet2: trunk to r-a Ethernet1
interface Ethernet2
   switchport mode trunk
   switchport trunk allowed vlan 99
!
end

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