BGP on pod #4 - 1/13/05

[Tom4498]

Layer 2
10.x.x.x
loopbacks 10.x.x.x 255.255.0.0
Frame2 10.10.14.x 255.255.0.0
R3toR7 10.10.37.x 255.255.255.240

R1,R2,R3 - 192.168.x.x
Frame1 192.168.1.x 255.255.255.0
R1toR2 192.168.12.x 255.255.255.240
VLAN10 192.168.10.x 255.255.255.0
VLAN20 192.168.20.x 255.255.255.0

R4,R5,R7 - 172.16.x.x
ISDN 172.16.57.x 255.255.255.240
VLAN40 172.16.40.x 255.255.255.0
R5toR4 172.16.54.x 255.255.255.240

Switch1
en
vlan database
vlan 10 name VLAN10
vlan 20 name VLAN20
vlan 40 name VLAN40
apply
exit
config t
int fa 0/1
speed 10
duplex half
switchport mode access
switchport access vlan 10
exit
int fa 0/2
speed 10
duplex half
switchport mode access
switchport access vlan 20
exit
int fa 0/3
speed 10
duplex half
switchport mode access
switchport access vlan 20
exit
int fa 0/4
speed 10
duplex half
switchport mode access
switchport access vlan 40
exit
int fa 0/7
speed 10
duplex half
switchport mode access
switchport access vlan 40
end
wr mem

R6
en
config t
int s 0
clockrate 125000
exit
int s 1
clockrate 125000
end
wr mem

R1
en
config t
no ip domain lookup
int loopback 0
ip address 10.1.1.1 255.255.0.0
exit
int e 0
ip address 192.168.10.1 255.255.255.0
no shut
exit
int s 0
no ip address
encapsulation frame-relay
no shut
exit
int s 0.1 multipoint
ip address 192.168.1.1 255.255.255.0
no arp frame-relay
no frame-relay inverse-arp
frame-relay map ip 192.168.1.2 102 broadcast
frame-relay map ip 192.168.1.3 103 broadcast
exit
int s 0.2 point-to-point
ip address 10.10.14.1 255.255.0.0
frame-relay interface-dlci 104
exit
int s 1
ip address 192.168.12.1 255.255.255.240
no shut
end
wr mem

R2
en
config t
no ip domain lookup
int loopback 0
ip address 10.2.2.2 255.255.0.0
exit
int e 0
ip address 192.168.20.2 255.255.255.0
no shut
exit
int s 0
encapsulation frame-relay
ip address 192.168.1.2 255.255.255.0
no arp frame-relay
no frame-relay inverse-arp
frame-relay map ip 192.168.1.1 201 broadcast
frame-relay map ip 192.168.1.3 201 broadcast
no shut
exit
int s 1
clockrate 125000
ip address 192.168.12.2 255.255.255.240
no shut
end
wr mem

R3
en
config t
no ip domain lookup
int loopback 0
ip address 10.3.3.3 255.255.0.0
exit
int e 0
ip address 192.168.20.3 255.255.255.0
no shut
exit
int s 0
encapsulation frame-relay
ip address 192.168.1.3 255.255.255.0
no arp frame-relay
no frame-relay inverse-arp
frame-relay map ip 192.168.1.1 301 broadcast
frame-relay map ip 192.168.1.2 301 broadcast
no shut
exit
int s 1
ip address 10.10.37.3 255.255.255.240
no shut
end
wr mem

R4
en
config t
no ip domain lookup
int loopback 0
ip address 10.4.4.4 255.255.0.0
exit
int e 0
ip address 172.16.40.4 255.255.255.0
no shut
exit
int s 0
no ip address
encapsulation frame-relay
no shut
int s 0.1 point-to-point
ip address 10.10.14.4 255.255.0.0
frame-relay interface-dlci 401
exit
int s 1
ip address 172.16.54.4 255.255.255.240
no shut
end
wr mem

R5
en
config t
no ip domain lookup
int loopback 0
ip address 10.5.5.5 255.255.0.0
exit
int bri 0
ip address 172.16.57.5 255.255.255.240
encapsulation ppp
isdn switch-type basic-ni
isdn spid1 555111111100 5551111111
isdn spid2 555222222200 5552222222
no shut
dialer map ip 172.16.57.7 name r7 broadcast 7771111111
int s 1
clockrate 125000
ip address 172.16.54.5 255.255.255.240
no shut
end
wr mem

R7
en
config t
no ip domain lookup
int loopback 0
ip address 10.7.7.7 255.255.0.0
exit
int e 0/0
ip address 172.16.40.7 255.255.255.0
no shut
exit
int bri 0/0
ip address 172.16.57.7 255.255.255.240
encapsulation ppp
isdn switch-type basic-ni
isdn spid1 777111111100 7771111111
isdn spid2 777222222200 7772222222
no shut
dialer map ip 172.16.57.5 name r5 broadcast 5551111111
int s 0/0
clockrate 125000
ip address 10.10.37.7 255.255.255.240
no shut
end
wr mem


Layer 3 - BGP
- route-maps
- redistribution
R1
en
config t
router bgp 65001
neighbor 192.168.12.2 remote-as 65001
network 192.168.12.0
network 192.168.10.0
network 10.10.0.0
network 192.168.1.0
end
wr mem

R2
en
config t
router bgp 65001
neighbor 192.168.12.1 remote-as 65001
neighbor 192.168.20.3 remote-as 3
redistribute connected
end
wr mem

R3
en
config t
router bgp 3
neighbor 10.10.37.7 remote-as 3
neighbor 192.168.20.2 remote-as 65001
network 10.10.37.0 mask 255.255.255.0
network 192.168.20.0 mask 255.255.255.0
network 192.168.1.0 mask 255.255.255.0
end
wr mem

R4
en
config t
router bgp 5
neighbor 172.16.54.5 remote-as 5
network 172.16.40.4 mask 255.255.255.0
network 10.10.14.4 mask 255.255.0.0
network 172.16.54.0 mask 255.255.255.0
end
wr mem

R5
en
config t
router bgp 5
neighbor 172.16.54.4 remote-as 5
neighbor 172.16.57.5 remote-as 5
network 172.16.54.0 mask 255.255.255.0
network 172.16.57.0 mask 255.255.255.0
end
wr mem

R7
en
config t
router bgp 3
neighbor 10.10.37.7 remote-as 3
neighbor 172.16.57.5 remote-as 5
network 10.10.37.0 mask 255.255.255.0
network 172.16.40.0 mask 255.255.255.0
network 172.16.57.0 mask 255.255.255.0
end
wr mem


Layer 3 Experiments
OSPF default Route
on R1
en
config t
ip route 0.0.0.0 0.0.0.0 10.10.14.4
router ospf 1
default-information originate metric 30 always metric-type 1
end
wr mem

[Tom4498]

I am pretty sure I had some configuration errors in BGP. Anyway, the first thing I do when I configure BGP is run show ip bgp summary and look at Up/Down and State/PfxRcd. Active means there is a problem with your config. If State/PfxRcd has a number in it at least one of your connections is good.

R1#sh ip bgp sum
BGP router identifier 10.1.1.1, local AS number 65001
BGP table version is 1, main routing table version 1
4 network entries using 388 bytes of memory
4 path entries using 144 bytes of memory
1 BGP path attribute entries using 60 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 592 total bytes of memory
BGP activity 4/0 prefixes, 4/0 paths, scan interval 60 secs

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd

192.168.12.2 4 65001 0 0 0 0 0 never Active


While I was writing this I got. BGP is very slow to sync compared to OSPF, which is nearly instant.

00:02:20: %BGP-5-ADJCHANGE: neighbor 192.168.12.2 Up
R1#sh ip bgp sum
BGP router identifier 10.1.1.1, local AS number 65001
BGP table version is 8, main routing table version 8
5 network entries using 485 bytes of memory
7 path entries using 252 bytes of memory
2 BGP path attribute entries using 120 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 857 total bytes of memory
BGP activity 5/0 prefixes, 9/2 paths, scan interval 60 secs

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd

192.168.12.2 4 65001 7 8 8 0 0 00:02:11 4

This shows 4 routes being advertised. A common mistake I have made at this point is using the incorrect subnet mask. If you get this wrong, the route is not advertised and there is no error.


R2#sh ip bgp sum
BGP router identifier 10.2.2.2, local AS number 65001
BGP table version is 6, main routing table version 6
5 network entries using 485 bytes of memory
9 path entries using 324 bytes of memory
3 BGP path attribute entries using 180 bytes of memory
1 BGP AS-PATH entries using 24 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 1013 total bytes of memory
BGP activity 5/0 prefixes, 10/1 paths, scan interval 60 secs

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd

192.168.12.1 4 65001 10 9 6 0 0 00:04:16 3
192.168.20.3 4 3 8 9 6 0 0 00:03:53 2

R2 is good!

[Tom4498]

In order to have time to experiment I dispensed with an IGP. However, I forgot to add no sync so BGP wouldn't wait for IGP syncronization.

I am still having one problem between R3 and R7.

R3#sh ip bgp sum
BGP router identifier 10.3.3.3, local AS number 3
BGP table version is 10, main routing table version 10
9 network entries using 873 bytes of memory
11 path entries using 396 bytes of memory
3 BGP path attribute entries using 180 bytes of memory
1 BGP AS-PATH entries using 24 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 1473 total bytes of memory
BGP activity 9/0 prefixes, 11/0 paths, scan interval 60 secs

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd

10.10.37.7 4 3 0 0 0 0 0 never Active <----
192.168.20.2 4 65001 42 42 10 0 0 00:35:10 7

I decided to take a step back and make sure the neighbor was reachable.

R3#show int s 1
Serial1 is up, line protocol is up
Hardware is HD64570
Internet address is 10.10.37.3/28
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
Last input 00:00:02, output 00:00:03, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/1/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 1158 kilobits/sec
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
275 packets input, 16563 bytes, 0 no buffer
Received 256 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
277 packets output, 16611 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 output buffer failures, 0 output buffers swapped out
7 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up

R3#ping 10.10.37.7

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.10.37.7, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/20/28 ms

This looks good, but the loopback needs to be reachable as well.

R3#ping 10.7.7.7

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.7.7.7, timeout is 2 seconds:
U.U

R7#ping 10.3.3.3

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.3.3.3, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)

R7#ping 10.10.37.3

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.10.37.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/18/20 ms

The loopbacks are unreachable, but the serial line is good.


R7#sh ip bgp
BGP table version is 5, local router ID is 10.7.7.7
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path
*> 10.7.0.0/16 0.0.0.0 0 32768 i
*> 10.10.37.0/28 0.0.0.0 0 32768 i
*> 172.16.40.0/24 0.0.0.0 0 32768 i
*> 172.16.57.0/28 0.0.0.0 0 32768 i

It turns out there was no problem and I just forgot the neighbor statement on the R7 side.

[Tom4498]

I tried to create a neighbor relationship between R7 and R5 over a connection that relies on R4. Since R4 can't propogate routes without a routing protocol, R5 was unreachable on s 1. I would have had to resort to a static router so I created the relationship between R7 and R4 on ethernet.

[Tom4498]

I needed to create two ways out of an AS. Since I have already explored the problems connecting R7 to R5, it makes sense to work with R1 and R3.

A connection between R1 and R3 doesn't require ebgp-multihop.

[Tom4498]

Before....
R4#sh ip bgp
BGP table version is 17, local router ID is 10.4.4.4
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path
*> 10.1.0.0/16 172.16.40.7 0 3 65001 i <----
*> 10.2.0.0/16 172.16.40.7 0 3 65001 ? <----
*> 10.3.0.0/16 172.16.40.7 0 3 i
*> 10.4.0.0/16 0.0.0.0 0 32768 i
*>i10.5.0.0/16 172.16.54.5 0 100 0 i
*> 10.7.0.0/16 172.16.40.7 0 0 3 i
*> 10.10.0.0/16 0.0.0.0 0 32768 i
*> 10.10.37.0/28 172.16.40.7 0 0 3 i
* 172.16.40.0/24 172.16.40.7 0 0 3 i
*> 0.0.0.0 0 32768 i
*> 172.16.54.0/28 0.0.0.0 0 32768 i
* i 172.16.54.5 0 100 0 i
* 172.16.57.0/28 172.16.40.7 0 0 3 i
*>i 172.16.54.5 0 100 0 i
*> 192.168.1.0 172.16.40.7 0 3 i
*> 192.168.10.0 172.16.40.7 0 3 65001 i <----
*> 192.168.12.0/28 172.16.40.7 0 3 65001 ? <----
*> 192.168.20.0 172.16.40.7 0 3 i


en
config t
router bgp 3
neighbor 172.16.40.4 remove-private-AS
end
wr mem

When you want changes to happen fast or you correct a bgp problem, you can reset bgp without rebooting with clear ip bgp *.

after....
R4#sh ip bgp
BGP table version is 16, local router ID is 10.4.4.4
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path
*> 10.1.0.0/16 172.16.40.7 0 3 i
*> 10.2.0.0/16 172.16.40.7 0 3 ?
*> 10.3.0.0/16 172.16.40.7 0 3 i
*> 10.4.0.0/16 0.0.0.0 0 32768 i
*>i10.5.0.0/16 172.16.54.5 0 100 0 i
*> 10.7.0.0/16 172.16.40.7 0 0 3 i
* 10.10.0.0/16 172.16.40.7 0 3 i
*> 0.0.0.0 0 32768 i
*> 10.10.37.0/28 172.16.40.7 0 0 3 i
* 172.16.40.0/24 172.16.40.7 0 0 3 i
*> 0.0.0.0 0 32768 i
*> 172.16.54.0/28 0.0.0.0 0 32768 i
* i 172.16.54.5 0 100 0 i
* 172.16.57.0/28 172.16.40.7 0 0 3 i
*>i 172.16.54.5 0 100 0 i
*> 192.168.1.0 172.16.40.7 0 3 i
*> 192.168.10.0 172.16.40.7 0 3 i
*> 192.168.12.0/28 172.16.40.7 0 3 ?
Network Next Hop Metric LocPrf Weight Path
*> 192.168.20.0 172.16.40.7 0 3 i

[Tom4498]

en
config t
route-map ADDASNUMBERS permit 10
match ip address 10
set as-path prepend 3 3
exit
access-list 10 permit 10.1.0.0 255.255.0.0
access-list 10 permit 10.2.0.0 255.255.0.0
access-list 10 permit 192.168.10.0 255.255.255.0
access-list 10 permit 192.168.12.0 255.255.255.240
router bgp 3
neighbor 192.168.20.2 route-map ADDASNUMBERS out
end
wr mem

THis should add two 3s to the AS path. I had to change the out to in.

R3#sh ip bgp
BGP table version is 19, local router ID is 10.3.3.3
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path
*> 10.1.0.0/16 192.168.1.2 0 65001 i
* 192.168.20.2 0 3 3 65001 i
*> 10.2.0.0/16 192.168.1.2 0 0 65001 ?
* 192.168.20.2 0 0 3 3 65001 ?
*> 10.3.0.0/16 0.0.0.0 0 32768 i
*>i10.4.0.0/16 172.16.40.4 0 100 0 5 i
*>i10.5.0.0/16 172.16.40.4 0 100 0 5 i
*>i10.7.0.0/16 10.10.37.7 0 100 0 i
*> 10.10.0.0/16 192.168.1.2 0 65001 i
* 192.168.20.2 0 3 3 65001 i
* i 172.16.40.4 0 100 0 5 i
*> 10.10.37.0/28 0.0.0.0 0 32768 i
* i 10.10.37.7 0 100 0 i
*>i172.16.40.0/24 10.10.37.7 0 100 0 i
*>i172.16.54.0/28 172.16.40.4 0 100 0 5 i
*>i172.16.57.0/28 10.10.37.7 0 100 0 i
*> 192.168.1.0 0.0.0.0 0 32768 i
* 192.168.1.2 0 0 65001 ?
Network Next Hop Metric LocPrf Weight Path
* 192.168.20.2 0 0 3 3 65001 ?
*> 192.168.10.0 192.168.1.2 0 65001 i
* 192.168.20.2 0 3 3 65001 i
*> 192.168.12.0/28 192.168.1.2 0 0 65001 ?
* 192.168.20.2 0 0 3 3 65001 ?
*> 192.168.20.0 0.0.0.0 0 32768 i
* 192.168.1.2 0 0 65001 ?
* 192.168.20.2 0 0 3 3 65001 ?

However, on reflection this is the wrong place to put the AS prepend. It should be set on R7 outbound.


en
config t
route-map ADDASNUMBERS permit 10
match ip address 10
set as-path prepend 3 3
exit
access-list 10 permit 10.1.0.0 255.255.0.0
access-list 10 permit 10.2.0.0 255.255.0.0
access-list 10 permit 192.168.10.0 255.255.255.0
access-list 10 permit 192.168.12.0 255.255.255.240
router bgp 3
neighbor 172.16.40.4 route-map ADDASNUMBERS out
end
wr mem

I had to do a reboot to unconfuse bgp. It was probably upset about the sloppy move from R3 to R7. A reload cleared it and let me see this on R4.

R4#sh ip bgp
BGP table version is 17, local router ID is 10.4.4.4
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path
*> 10.1.0.0/16 172.16.40.7 0 3 3 3 i
*> 10.2.0.0/16 172.16.40.7 0 3 3 3 ?
*> 10.3.0.0/16 172.16.40.7 0 3 3 3 i
*> 10.4.0.0/16 0.0.0.0 0 32768 i
*>i10.5.0.0/16 172.16.54.5 0 100 0 i
*> 10.7.0.0/16 172.16.40.7 0 0 3 3 3 i
*> 10.10.0.0/16 0.0.0.0 0 32768 i
*> 10.10.37.0/28 172.16.40.7 0 0 3 3 3 i
* 172.16.40.0/24 172.16.40.7 0 0 3 3 3 i
*> 0.0.0.0 0 32768 i
*> 172.16.54.0/28 0.0.0.0 0 32768 i
* i 172.16.54.5 0 100 0 i
* 172.16.57.0/28 172.16.40.7 0 0 3 3 3 i
*>i 172.16.54.5 0 100 0 i
*> 192.168.1.0 172.16.40.7 0 3 3 3 i
*> 192.168.10.0 172.16.40.7 0 3 3 3 i
*> 192.168.12.0/28 172.16.40.7 0 3 3 3 ?
*> 192.168.20.0 172.16.40.7 0 3 3 3 i

[Tom4498]

There isn't much you can do with this configuration on BGP. I am going to try five routers in one AS and one external BGP router. I can test alot of BGP attributes, confederations, etc. This might be a better setup.

[Tom4498]

R1#sh ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
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 not set

192.168.12.0/28 is subnetted, 1 subnets
C 192.168.12.0 is directly connected, Serial1
C 192.168.10.0/24 is directly connected, Ethernet0
172.16.0.0/16 is variably subnetted, 3 subnets, 2 masks
B 172.16.57.0/28 [200/0] via 192.168.1.3, 00:14:52
B 172.16.54.0/28 [200/0] via 192.168.1.3, 00:13:55
B 172.16.40.0/24 [200/0] via 192.168.1.3, 00:14:52
B 192.168.20.0/24 [200/0] via 192.168.12.2, 00:15:16
10.0.0.0/8 is variably subnetted, 8 subnets, 2 masks
C 10.10.0.0/16 is directly connected, Serial0.2
B 10.2.0.0/16 [200/0] via 192.168.12.2, 00:15:17
B 10.3.0.0/16 [200/0] via 192.168.1.3, 00:15:17
C 10.1.0.0/16 is directly connected, Loopback0
B 10.7.0.0/16 [200/0] via 192.168.1.3, 00:14:55
B 10.4.0.0/16 [200/0] via 192.168.1.3, 00:13:57
B 10.5.0.0/16 [200/0] via 192.168.1.3, 00:13:57
B 10.10.37.0/28 [200/0] via 192.168.1.3, 00:15:18
C 192.168.1.0/24 is directly connected, Serial0.1



R4#sh ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
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 not set

192.168.12.0/28 is subnetted, 1 subnets
B 192.168.12.0 [20/0] via 172.16.40.7, 00:16:04
B 192.168.10.0/24 [20/0] via 172.16.40.7, 00:15:36
172.16.0.0/16 is variably subnetted, 3 subnets, 2 masks
B 172.16.57.0/28 [200/0] via 172.16.54.5, 00:16:50
C 172.16.54.0/28 is directly connected, Serial1
C 172.16.40.0/24 is directly connected, Ethernet0
B 192.168.20.0/24 [20/0] via 172.16.40.7, 00:16:04
10.0.0.0/8 is variably subnetted, 8 subnets, 2 masks
C 10.10.0.0/16 is directly connected, Serial0.1
B 10.2.0.0/16 [20/0] via 172.16.40.7, 00:16:05
B 10.3.0.0/16 [20/0] via 172.16.40.7, 00:16:05
B 10.1.0.0/16 [20/0] via 172.16.40.7, 00:15:37
B 10.7.0.0/16 [20/0] via 172.16.40.7, 00:16:06
C 10.4.0.0/16 is directly connected, Loopback0
B 10.5.0.0/16 [200/0] via 172.16.54.5, 00:16:52
B 10.10.37.0/28 [20/0] via 172.16.40.7, 00:16:06
B 192.168.1.0/24 [20/0] via 172.16.40.7, 00:16:06