I have three routers – (a HSRP pair RTR2A and RTR2B and a router RTR3 and a firewall – the firewall is setup to capture packets on its interface connected to RTR2A as I am having problems with routing
RTR3 is being used to send packets to the IP addresses 172.17.4.10 and 172.17.5.10 – The routing tables for the two networks containing these addresses look the same to me
Router 2A Sho ip route output
#sho ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
a - application route
+ - replicated route, % - next hop override
Gateway of last resort is 10.1.64.4 to network 0.0.0.0
S* 0.0.0.0/0 [1/0] via 10.1.64.4
10.0.0.0/8 is variably subnetted, 9 subnets, 4 masks
C 10.1.0.0/21 is directly connected, GigabitEthernet1/0/2
L 10.1.0.100/32 is directly connected, GigabitEthernet1/0/2
C 10.1.64.0/29 is directly connected, Vlan50
L 10.1.64.2/32 is directly connected, Vlan50
C 10.1.64.8/29 is directly connected, Vlan26
L 10.1.64.10/32 is directly connected, Vlan26
C 10.1.65.0/24 is directly connected, Vlan25
L 10.1.65.2/32 is directly connected, Vlan25
S 10.10.10.0/24 [1/0] via 10.1.64.12
172.17.0.0/24 is subnetted, 2 subnets
S 172.17.4.0 [1/0] via 10.1.64.12
S 172.17.5.0 [1/0] via 10.1.64.12
Router 3 Sho ip route
#sho ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 192.168.3.1 to network 0.0.0.0
172.17.0.0/24 is subnetted, 2 subnets
S 172.17.5.0 [1/0] via 10.1.64.1
S 172.17.4.0 [1/0] via 10.1.64.1
158.89.0.0/16 is variably subnetted, 2 subnets, 2 masks
C 158.89.24.240/28 is directly connected, Vlan2
C 158.89.23.0/24 is directly connected, Vlan4
10.0.0.0/8 is variably subnetted, 5 subnets, 4 masks
S 10.10.10.0/24 [1/0] via 10.1.64.1
S 10.1.0.0/21 [1/0] via 10.1.64.1
C 10.1.16.0/22 is directly connected, FastEthernet1/0/23
S 10.1.65.0/24 [1/0] via 10.1.64.1
C 10.1.64.0/29 is directly connected, Vlan50
192.168.3.0/29 is subnetted, 1 subnets
C 192.168.3.0 is directly connected, Vlan3
S* 0.0.0.0/0 [1/0] via 192.168.3.1
Router 2B sho IP route
#sho ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
a - application route
+ - replicated route, % - next hop override
Gateway of last resort is 10.1.64.4 to network 0.0.0.0
S* 0.0.0.0/0 [1/0] via 10.1.64.4
10.0.0.0/8 is variably subnetted, 9 subnets, 4 masks
C 10.1.0.0/21 is directly connected, GigabitEthernet1/0/2
L 10.1.0.101/32 is directly connected, GigabitEthernet1/0/2
C 10.1.64.0/29 is directly connected, Vlan50
L 10.1.64.3/32 is directly connected, Vlan50
C 10.1.64.8/29 is directly connected, Vlan26
L 10.1.64.11/32 is directly connected, Vlan26
C 10.1.65.0/24 is directly connected, Vlan25
L 10.1.65.3/32 is directly connected, Vlan25
S 10.10.10.0/24 [1/0] via 10.1.64.12
172.17.0.0/24 is subnetted, 2 subnets
S 172.17.4.0 [1/0] via 10.1.64.12
S 172.17.5.0 [1/0] via 10.1.64.12
If I tracer 172.17.4.10 The firewall sees the udp packets (which is what I want)
My problem is if I tracer 172.17.5.10 the firewall does not see the udp packets – and I see the traceroute going between 10.1.64.2 and 10.1.64.4
Tracer 172.17.5.10
10.1.64.2 0ms 0ms 0ms
10.1.64.4 8ms 0ms 6ms
10.1.64.2 0ms 0ms 0ms
^c
If I ping 172.17.5.10 from Router2A the firewall does see the packets
Router 3 is a 3750 , Router 2 are 3850s
There is no device with an IP in the range 172.17.5.0/25 – I am using this to demonstrate the problem to myself
So I'm close to saying this is a bug – I'm waiting for a reboot but my questions at the moment are
- Does the order of the output of sho Ip route indicate some
difference in how the routes are operating? - Can anyone see a difference in the routing tables?
- If not then is there some other mechanism that a router uses to route packets other than the routing tables? – in relation to this there is no ip source-route on the routers
Thanks for the attention and questions
The Level 2 A Router config
RTR2A>enable
Password:
RTR2A#
RTR2A#term len 0
RTR2A#sho run
Building configuration...
Current configuration : 10133 bytes
!
! Last configuration change at 01:23:49 UTC Wed Mar 28 2018 by admin
! NVRAM config last updated at 01:25:41 UTC Wed Mar 28 2018 by admin
!
version 15.2
no service pad
service tcp-keepalives-in
service tcp-keepalives-out
service timestamps debug datetime
service timestamps log datetime
service password-encryption
service compress-config
no service dhcp
!
hostname RTR2A
!
boot-start-marker
boot system switch all flash:cat3k_caa-universalk9.SPA.03.07.04.E.152-3.E4.bin
boot-end-marker
!
!
vrf definition Mgmt-vrf
!
address-family ipv4
exit-address-family
!
address-family ipv6
exit-address-family
!
logging buffered 10240
no logging console
enable XXXX
!
username XXXX
no aaa new-model
switch 1 provision ws-c3850-24t
!
!
!
!
!
coap http enable
!
!
!
!
!
!
no ip source-route
ip routing
no ip gratuitous-arps
!
no ip domain-lookup
!
!
qos queue-softmax-multiplier 100
vtp mode transparent
!
crypto pki trustpoint TP-self-signed-999999999
enrollment selfsigned
subject-name cn=IOS-Self-Signed-Certificate-999999999
revocation-check none
rsakeypair TP-self-signed-999999999
!
!
crypto pki certificate chain TP-self-signed-99999999
certificate self-signed 01
Key Removed
quit
no errdisable detect cause loopback
errdisable recovery cause udld
errdisable recovery cause bpduguard
errdisable recovery cause security-violation
errdisable recovery cause channel-misconfig
errdisable recovery cause pagp-flap
errdisable recovery cause dtp-flap
errdisable recovery cause link-flap
errdisable recovery cause sfp-config-mismatch
errdisable recovery cause gbic-invalid
errdisable recovery cause l2ptguard
errdisable recovery cause psecure-violation
errdisable recovery cause port-mode-failure
errdisable recovery cause dhcp-rate-limit
errdisable recovery cause pppoe-ia-rate-limit
errdisable recovery cause mac-limit
errdisable recovery cause vmps
errdisable recovery cause storm-control
errdisable recovery cause inline-power
errdisable recovery cause arp-inspection
errdisable recovery cause loopback
errdisable recovery cause psp
errdisable recovery interval 180
diagnostic bootup level minimal
!
spanning-tree mode pvst
spanning-tree extend system-id
hw-switch switch 1 logging onboard message level 3
!
redundancy
mode sso
!
!
vlan 25
name XXXX
!
vlan 26
name FW
!
vlan 50
name L2RTR-L3RTR
!
vlan 51
name L2RTR-L2RTR
!
vlan 99
name unused
!
track 2 interface GigabitEthernet1/0/2 line-protocol
delay down 15 up 10
no cdp run
!
!
class-map match-any non-client-nrt-class
!
policy-map port_child_policy
class non-client-nrt-class
bandwidth remaining ratio 10
!
interface GigabitEthernet0/0
vrf forwarding Mgmt-vrf
ip address 169.254.245.1 255.255.0.0
negotiation auto
!
interface GigabitEthernet1/0/1
description XXXX
switchport access vlan 50
switchport mode access
speed 100
duplex full
!
interface GigabitEthernet1/0/2
description XXXX
no switchport
ip address 10.1.0.100 255.255.248.0
no ip redirects
no ip unreachables
no ip proxy-arp
standby 102 ip 10.1.0.1
standby 102 timers 2 6
standby 102 priority 105
standby 102 preempt delay minimum 90
speed 1000
duplex full
!
interface GigabitEthernet1/0/3
description XXXX
switchport access vlan 26
switchport mode access
!
interface GigabitEthernet1/0/4
description XXXX
switchport access vlan 99
switchport mode access
shutdown
speed 1000
duplex full
!
interface GigabitEthernet1/0/5
description XXXX
switchport access vlan 99
switchport mode access
shutdown
speed 1000
duplex full
spanning-tree portfast
!
interface GigabitEthernet1/0/6
description XXXX
switchport access vlan 99
switchport mode access
shutdown
spanning-tree portfast
!
interface GigabitEthernet1/0/7
description XXXX
switchport access vlan 99
switchport mode access
shutdown
!
interface GigabitEthernet1/0/8
description XXXX
switchport access vlan 99
switchport mode access
shutdown
!
interface GigabitEthernet1/0/9
description XXXX
switchport access vlan 25
switchport mode access
!
interface GigabitEthernet1/0/10
description XXXX
switchport access vlan 25
switchport mode access
!
interface GigabitEthernet1/0/11
description XXXX
switchport access vlan 25
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet1/0/12
description XXXX
switchport access vlan 25
switchport mode access
speed 1000
duplex full
spanning-tree portfast
!
interface GigabitEthernet1/0/13
description XXXX
switchport access vlan 25
switchport mode access
speed 1000
duplex full
!
interface GigabitEthernet1/0/14
description XXXX
switchport access vlan 25
switchport mode access
speed 1000
duplex full
!
interface GigabitEthernet1/0/15
description XXXX
switchport access vlan 99
switchport mode access
shutdown
speed 1000
duplex full
!
interface GigabitEthernet1/0/16
description XXXX
switchport access vlan 99
shutdown
speed 1000
duplex full
!
interface GigabitEthernet1/0/17
description XXXX
switchport access vlan 99
switchport mode access
shutdown
speed 1000
duplex full
spanning-tree portfast
!
interface GigabitEthernet1/0/18
description XXXX
switchport access vlan 25
switchport mode access
speed 1000
duplex full
spanning-tree portfast
!
interface GigabitEthernet1/0/19
description XXXX
switchport access vlan 25
switchport mode access
shutdown
speed 1000
duplex full
spanning-tree portfast
!
interface GigabitEthernet1/0/20
description XXXX
switchport access vlan 25
switchport mode access
shutdown
speed 1000
duplex full
spanning-tree portfast
!
interface GigabitEthernet1/0/21
description XXXX
switchport access vlan 25
switchport mode access
speed 1000
duplex full
!
interface GigabitEthernet1/0/22
description XXXX
switchport access vlan 50
!
interface GigabitEthernet1/0/23
description XXXX
switchport access vlan 99
shutdown
!
interface GigabitEthernet1/0/24
description XXXX
switchport mode trunk
speed 1000
duplex full
!
interface GigabitEthernet1/1/1
description XXXX
shutdown
!
interface GigabitEthernet1/1/2
description XXXX
shutdown
!
interface GigabitEthernet1/1/3
description XXXX
shutdown
!
interface GigabitEthernet1/1/4
description XXXX
shutdown
!
interface TenGigabitEthernet1/1/1
!
interface TenGigabitEthernet1/1/2
!
interface TenGigabitEthernet1/1/3
!
interface TenGigabitEthernet1/1/4
!
interface Vlan1
description XXXX
no ip address
no ip route-cache
shutdown
!
interface Vlan25
description XXXX
ip address 10.1.65.2 255.255.255.0
no ip redirects
no ip unreachables
no ip proxy-arp
standby 25 ip 10.1.65.1
standby 25 timers 2 6
standby 25 priority 101
standby 25 preempt delay minimum 90
standby 25 track 2 decrement 10
!
interface Vlan26
description FW
ip address 10.1.64.10 255.255.255.248
no ip redirects
no ip unreachables
no ip proxy-arp
standby 26 ip 10.1.64.9
standby 26 timers 2 6
standby 26 priority 101
standby 26 preempt delay minimum 90
standby 26 track 2 decrement 10
!
interface Vlan50
description L2RTR-L3RTR
ip address 10.1.64.2 255.255.255.248
no ip redirects
no ip unreachables
no ip proxy-arp
standby 50 ip 10.1.64.1
standby 50 timers 2 6
standby 50 priority 101
standby 50 preempt delay minimum 90
standby 50 track 2 decrement 10
!
ip default-gateway 10.1.64.4
ip forward-protocol nd
no ip http server
ip http authentication local
no ip http secure-server
!
ip route 0.0.0.0 0.0.0.0 10.1.64.4
ip route 10.10.10.0 255.255.255.0 10.1.64.12
ip route 172.17.4.0 255.255.255.0 10.1.64.12
ip route 172.17.5.0 255.255.255.0 10.1.64.12
!
!
logging trap notifications
!
snmp-server XXXX
snmp-server XXXX
snmp-server XXXX
snmp-server XXXX
snmp-server XXXX
!
!
!
line con 0
exec-timeout 30 0
stopbits 1
line aux 0
stopbits 1
line vty 0 4
exec-timeout 15 0
password XXXX
logging synchronous
login local
transport input ssh
line vty 5 15
login
!
ntp server 158.89.24.242 source GigabitEthernet1/0/1
ntp server 158.89.25.250 source GigabitEthernet1/0/1
wsma agent exec
profile httplistener
profile httpslistener
!
wsma agent config
profile httplistener
profile httpslistener
!
wsma agent filesys
profile httplistener
profile httpslistener
!
wsma agent notify
profile httplistener
profile httpslistener
!
!
wsma profile listener httplistener
transport http
!
wsma profile listener httpslistener
transport https
!
ap group default-group
end
RTR2B config
RTR2B>enable
Password:
RTR2B#
RTR2B#term len 0
RTR2B#sho run
Building configuration...
Current configuration : 10212 bytes
!
! Last configuration change at 00:20:04 UTC Wed Mar 28 2018 by admin
! NVRAM config last updated at 01:25:44 UTC Wed Mar 28 2018 by admin
!
version 15.2
no service pad
service tcp-keepalives-in
service tcp-keepalives-out
service timestamps debug datetime
service timestamps log datetime
service password-encryption
service compress-config
no service dhcp
!
hostname RTR2B
!
boot-start-marker
boot system switch all flash:cat3k_caa-universalk9.SPA.03.07.04.E.152-3.E4.bin
boot-end-marker
!
!
vrf definition Mgmt-vrf
!
address-family ipv4
exit-address-family
!
address-family ipv6
exit-address-family
!
logging buffered 10240
no logging console
enable XXXX
!
username XXXX
no aaa new-model
switch 1 provision ws-c3850-24t
!
!
!
!
!
coap http enable
!
!
!
!
!
!
no ip source-route
ip routing
no ip gratuitous-arps
!
no ip domain-lookup
!
!
qos queue-softmax-multiplier 100
vtp mode transparent
!
crypto pki trustpoint TP-self-signed-999999999
enrollment selfsigned
subject-name cn=IOS-Self-Signed-Certificate-999999999
revocation-check none
rsakeypair TP-self-signed-999999999
!
!
crypto pki certificate chain TP-self-signed-99999999
certificate self-signed 01
Key Removed
quit
no errdisable detect cause loopback
errdisable recovery cause udld
errdisable recovery cause bpduguard
errdisable recovery cause security-violation
errdisable recovery cause channel-misconfig
errdisable recovery cause pagp-flap
errdisable recovery cause dtp-flap
errdisable recovery cause link-flap
errdisable recovery cause sfp-config-mismatch
errdisable recovery cause gbic-invalid
errdisable recovery cause l2ptguard
errdisable recovery cause psecure-violation
errdisable recovery cause port-mode-failure
errdisable recovery cause dhcp-rate-limit
errdisable recovery cause pppoe-ia-rate-limit
errdisable recovery cause mac-limit
errdisable recovery cause vmps
errdisable recovery cause storm-control
errdisable recovery cause inline-power
errdisable recovery cause arp-inspection
errdisable recovery cause loopback
errdisable recovery cause psp
errdisable recovery interval 180
diagnostic bootup level minimal
!
spanning-tree mode pvst
spanning-tree extend system-id
hw-switch switch 1 logging onboard message level 3
!
redundancy
mode sso
!
!
vlan 25
name XXXX
!
vlan 26
name FW
!
vlan 50
name L2RTR-L3RTR
!
vlan 51
name L2RTR-L2RTR
!
vlan 99
name unused
!
track 2 interface GigabitEthernet1/0/2 line-protocol
delay down 15 up 10
no cdp run
!
!
class-map match-any non-client-nrt-class
!
policy-map port_child_policy
class non-client-nrt-class
bandwidth remaining ratio 10
!
!
interface GigabitEthernet0/0
vrf forwarding Mgmt-vrf
ip address 169.254.245.2 255.255.0.0
negotiation auto
!
interface GigabitEthernet1/0/1
description XXXX
switchport access vlan 50
switchport mode access
speed 100
duplex full
!
interface GigabitEthernet1/0/2
description XXXX
no switchport
ip address 10.1.0.101 255.255.248.0
no ip redirects
no ip unreachables
no ip proxy-arp
standby 102 ip 10.1.0.1
standby 102 timers 2 6
standby 102 priority 95
standby 102 preempt delay minimum 90
speed 1000
duplex full
!
interface GigabitEthernet1/0/3
description XXXX
switchport access vlan 26
switchport mode access
!
interface GigabitEthernet1/0/4
description XXXX
switchport access vlan 99
switchport mode access
shutdown
speed 1000
duplex full
!
interface GigabitEthernet1/0/5
description XXXX
switchport access vlan 99
switchport mode access
shutdown
speed 1000
duplex full
spanning-tree portfast
!
interface GigabitEthernet1/0/6
description XXXX
switchport access vlan 99
switchport mode access
shutdown
spanning-tree portfast
!
interface GigabitEthernet1/0/7
description XXXX
switchport access vlan 99
switchport mode access
shutdown
!
interface GigabitEthernet1/0/8
description XXXX
switchport access vlan 99
switchport mode access
shutdown
!
interface GigabitEthernet1/0/9
description XXXX
switchport access vlan 25
switchport mode access
!
interface GigabitEthernet1/0/10
description XXXX
switchport access vlan 25
switchport mode access
!
interface GigabitEthernet1/0/11
description XXXX
switchport access vlan 25
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet1/0/12
description XXXX
switchport access vlan 25
switchport mode access
speed 1000
duplex full
spanning-tree portfast
!
interface GigabitEthernet1/0/13
description XXXX
switchport access vlan 25
switchport mode access
speed 1000
duplex full
!
interface GigabitEthernet1/0/14
description XXXX
switchport access vlan 25
switchport mode access
speed 1000
duplex full
!
interface GigabitEthernet1/0/15
description XXXX
switchport access vlan 99
switchport mode access
shutdown
speed 1000
duplex full
!
interface GigabitEthernet1/0/16
description XXXX
switchport access vlan 99
shutdown
speed 1000
duplex full
!
interface GigabitEthernet1/0/17
description XXXX
switchport access vlan 99
switchport mode access
shutdown
speed 1000
duplex full
spanning-tree portfast
!
interface GigabitEthernet1/0/18
description XXXX
switchport access vlan 25
switchport mode access
speed 1000
duplex full
spanning-tree portfast
!
interface GigabitEthernet1/0/19
description XXXX
switchport access vlan 25
switchport mode access
shutdown
speed 1000
duplex full
spanning-tree portfast
!
interface GigabitEthernet1/0/20
description XXXX
switchport access vlan 25
switchport mode access
shutdown
speed 1000
duplex full
spanning-tree portfast
!
interface GigabitEthernet1/0/21
description XXXX
switchport access vlan 25
switchport mode access
speed 1000
duplex full
!
interface GigabitEthernet1/0/22
description XXXX
switchport access vlan 50
!
interface GigabitEthernet1/0/23
description XXXX
switchport access vlan 99
shutdown
!
interface GigabitEthernet1/0/24
description XXXX
switchport mode trunk
speed 1000
duplex full
!
interface GigabitEthernet1/1/1
description XXXX
shutdown
!
interface GigabitEthernet1/1/2
description XXXX
shutdown
!
interface GigabitEthernet1/1/3
description XXXX
shutdown
!
interface GigabitEthernet1/1/4
description XXXX
shutdown
!
interface TenGigabitEthernet1/1/1
!
interface TenGigabitEthernet1/1/2
!
interface TenGigabitEthernet1/1/3
!
interface TenGigabitEthernet1/1/4
!
interface Vlan1
description XXXX
no ip address
no ip route-cache
shutdown
!
interface Vlan25
description XXXX
ip address 10.1.65.3 255.255.255.0
no ip redirects
no ip unreachables
no ip proxy-arp
standby 25 ip 10.1.65.1
standby 25 timers 2 6
standby 25 priority 95
standby 25 preempt delay minimum 90
standby 25 track 2 decrement 10
!
interface Vlan26
description FW
ip address 10.1.64.11 255.255.255.248
no ip redirects
no ip unreachables
no ip proxy-arp
standby 26 ip 10.1.64.9
standby 26 timers 2 6
standby 26 priority 95
standby 26 preempt delay minimum 90
standby 26 track 2 decrement 10
!
interface Vlan50
description L2RTR-L3RTR
ip address 10.1.64.3 255.255.255.248
no ip redirects
no ip unreachables
no ip proxy-arp
standby 50 ip 10.1.64.1
standby 50 timers 2 6
standby 50 priority 95
standby 50 preempt delay minimum 90
standby 50 track 2 decrement 10
!
ip default-gateway 10.1.64.4
ip forward-protocol nd
no ip http server
ip http authentication local
no ip http secure-server
!
ip route 0.0.0.0 0.0.0.0 10.1.64.4
ip route 10.10.10.0 255.255.255.0 10.1.64.12
ip route 172.17.4.0 255.255.255.0 10.1.64.12
ip route 172.17.5.0 255.255.255.0 10.1.64.12
!
!
logging trap notifications
!
snmp-server XXXX
snmp-server XXXX
snmp-server XXXX
snmp-server XXXX
snmp-server XXXX
!
!
!
line con 0
exec-timeout 30 0
stopbits 1
line aux 0
stopbits 1
line vty 0 4
exec-timeout 15 0
password XXXX
logging synchronous
login local
transport input ssh
line vty 5 15
login
!
ntp server 158.89.24.242 source GigabitEthernet1/0/1
ntp server 158.89.25.250 source GigabitEthernet1/0/1
wsma agent exec
profile httplistener
profile httpslistener
!
wsma agent config
profile httplistener
profile httpslistener
!
wsma agent filesys
profile httplistener
profile httpslistener
!
wsma agent notify
profile httplistener
profile httpslistener
!
!
wsma profile listener httplistener
transport http
!
wsma profile listener httpslistener
transport https
!
ap group default-group
end
RTR3 172.17.5.10
RTR3#sho ip cef 172.17.5.10 detail
172.17.5.0/24, epoch 2
recursive via 10.1.64.1
attached to Vlan 50
RTR3 172.17.4.10
RTR3#sho ip cef 172.17.4.10 detail
172.17.4.0/24, epoch 2
recursive via 10.1.64.1
attached to Vlan 50
RTR2A 172.17.4.10
RTR2A#sho ip cef 172.17.4.10 detail
172.17.4.0/24, epoch 3
recursive via 10.1.64.12
attached to Vlan 26
RTR2A 172.17.5.10
Best Answer
Neither 172.17.4.10 nor 172.17.5.10 have specific routes in RTR2A/B. The static routes
miss a network mask. Accordingly, the default route back to RTR3 is chosen and the packet loops.
Edit:The config marked "One of the level 2 routers" lacks routes to the above subnets. The config marked "The Level 2 A Router config" has them included.