LAB 2-4A EIGRP FRAME RELAY HUB AND SPOKE: ROUTER USED AS

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LAB 2-4A EIGRP FRAME RELAY HUB AND SPOKE: ROUTER USED AS

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LAB 2-4A EIGRP FRAME RELAY HUB AND SPOKE: ROUTER USED AS FRAME SWITCH Sang-Gon LEE Prof./Ph.D Division of Computer and Information Engineering, Dongseo University, – PowerPoint PPT presentation

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Title: LAB 2-4A EIGRP FRAME RELAY HUB AND SPOKE: ROUTER USED AS

1
Lab 2-4a EIGRP Frame Relay Hub and Spoke Router
Used As Frame Switch

Sang-Gon LEE
Prof./Ph.D
Division of Computer and Information Engineering,
Dongseo University,
Director of Innovation Center for Engineering
Education(ICEE).

2
OBJECTIVES

Review basic configuration of EIGRP on a serial
interface
Configure the bandwidth-percent command
Configure EIGRP over Frame Relay hub and spoke
Use EIGRP in non-broadcast mode
Enable EIGRP manual summarization in topologies
with discontiguous major networks

3
TOPOLOGY

NOTE-
Given the diversity of router models and the
differing naming conventions for serial
interfaces (S0, S0/0, S0/0/0),
The interface numbers on devices will probably
differ from those in the topology diagram.

4
Contd..

Always draw network diagram to reflect topology.
If any uncertainty for DCE connection, then use
the show controllers serial interface_type
interface_number command
HQ show controllers serial0/0/0
Interface Serial0/0/0
Hardware is GT96K
DCE V.35, clock rate 2000000
ltoutput omittedgt

5
scenario

Suppose a company want to a new network between
company Headquarter(HQ) , East, and west
branches.
They are connected over hub and spoke Frame
relay. company headquarter use as Hub.
Each network with multiple loopback interfaces on
each router.
EIGRP to allow full connectivity between all
departments.
To simulate the Frame Relay WAN connections.
Use a router with three serial ports configured
as a frame switch.

6
STEP 1 ADDRESSING

Apply IP addresses to the loopback interfaces on
HQ, East, and West.
Paste the following configurations into routers
to begin must be in configuration mode when do
this.
HQ
!
interface Loopback1
ip address 10.1.1.1 255.255.224.0
interface Loopback33
ip address 10.1.33.1 255.255.224.0
interface Loopback65
ip address 10.1.65.1 255.255.224.0
interface Loopback97
ip address 10.1.97.1 255.255.224.0
interface Loopback129
ip address 10.1.129.1 255.255.224.0
interface Loopback161
ip address 10.1.161.1 255.255.224.0
!
end

7
Contd..

NOTE all code is same just replace the only 1,
In each address. (HQ1, East2, West3).
As Like East- ip address 10.2.1.1
255.255.224.0
West- ip address 10.3.1.1 255.255.224.0
For now, the IP address is the only configuration
on the serial interfaces.
Leave the serial interfaces with their default
encapsulation (HDLC)

8
Configurations

Recommendations are described in terms of
configuring the interface "bandwidth" parameter
EIGRP being able to use 50 percent of that
bandwidth by default.
Bandwidth configuration cannot be changed
Bandwidth-percent command should be used to
control the EIGRP bandwidth
On low-speed interfaces, raising the available
bandwidth for EIGRP above the default of 50
percent is advisable in order to improve
convergence.

9
Contd..

LAN Interfaces (Ethernet, Token Ring, FDDI)
set by default to the actual media speed
bandwidth is explicitly configured to a very low
value. Then need to configure.
Point-to-Point Serial Interfaces (HDLC, PPP)
defaults to T1 speed (1.544 Mbps) on serial
interfaces
set to the actual link speed.
NBMA Interfaces (Frame Relay, X.25, ATM)
particularly critical to configure nonbroadcast
multi-access (NBMA) interfaces correctly.
otherwise many EIGRP packets may be lost in the
switched network.

10
Contd..

Three basic rules
The traffic that EIGRP is allowed to send on a
single virtual circuit (VC) cannot exceed the
capacity of that VC.
The total EIGRP traffic for all virtual circuits
cannot exceed the access line speed of the
interface.
The bandwidth allowed for EIGRP on each virtual
circuit must be the same in each direction
Three different scenarios for NBMA interfaces
Pure Multipoint Configuration (no subinterfaces)
Pure Point-to-Point Configuration (each VC on a
separate subinterface)
Hybrid Configuration (point-to-point and
multipoint subinterfaces

11
PURE MULTIPOINT CONFIGURATION (NO SUBINTERFACES)

EIGRP will divide the configured bandwidth evenly
across each virtual circuit.
Must ensure that this will not overload each
virtual circuit.
For example
if you have a T1 access line with four 56K
VCs, you should configure the bandwidth to be
224Kbps (4 56Kbps) in order to avoid dropping
packets. If the total bandwidth of the virtual
circuits equals or exceeds the access line speed,
configure the bandwidth to equal the access line
speed. Note that if the virtual circuits are of
different capacities, the bandwidth must be set
to take into account the lowest capacity virtual
circuit.
For instance, if a T1 access line has three
256Kbps VCs and one 56Kbps VC, the bandwidth
should be set to 224Kbps (4 56Kbps). In such
configurations, putting at least the slow virtual
circuit onto a point-to-point subinterface is
strongly recommended

12
PURE
POINT-TO-POINT CONFIGURATION (EACH VC ON A
SEPARATE SUBINTERFACE)

configuration allows maximum bandwidth control,
since the bandwidth can be configured separately
on each subinterface
virtual circuits have different capacities. It is
best configuration.
total bandwidth for all subinterfaces cannot
exceed the available access line bandwidth
If the interface is oversubscribed, the access
line bandwidth must be divided across each of the
subinterfaces
For Example-
if a T1 access line (1544 Kbps) has ten virtual
circuits with a capacity of 256Kbps, the
bandwidth on each subinterface should be
configured to be 154Kbps (1544/10) instead of
256Kbps each.

13
HYBRID CONFIGURATION (POINT-TO-POINT AND
MULTIPOINT SUBINTERFACES)

combinations of the two individual strategies
Examples

To set the interface bandwidth to reflect the
PVC capacity,
Adjust the bandwidth prcentage for EIGRP.
example, the desired
bandwidth for EIGRP is
(256K/10).9 23.04K
the bandwidth percentage would be 23.04K/56K
.41 (41).
So the same effect would be
had by configuring
Interface Serial 0.1 point-to-point
bandwidth 56
ip bandwidth-percent eigrp 123 41

Dotted Line - corresponds to separate
PVC Color a separate IP subnet
14
Configuration

Hub Router
interface Serial 0
encapsulation frame-relay
!--- To enable Frame Relay encapsulation on the
interface.
interface Serial 0.1
point-to-point
!--- The subinterface is configured to function
as a point-to-point link using this command.
bandwidth 25
!--- To set the bandwidth value for this
interface.
ip bandwidth-percent eigrp 123 90
!--- To configure the percentage of bandwidth
that may be
!--- used by EIGRP on this interface.
interface Serial 0.2
point-to-point bandwidth 25
ip bandwidth-percent eigrp 123 90
Each of the ten spoke routers must be configured
to limit EIGRP traffic to the same rate as that
of the hub, in order to satisfy the third rule

15
Contd..

Spoke Router
interface Serial 0
encapsulation frame-relay
!--- To enable Frame Relay encapsulation on this
interface.
interface Serial 0.1 point-to-point
!--- The subinterface is configured to function
as a point-to-point link
!--- using this command.
bandwidth 25
!--- To set the bandwidth value for this
interface.
ip bandwidth-percent eigrp 123 90
!--- To configure the percentage of bandwidth
that may be
!--- used by EIGRP on this interface.

16
FULL-MESH FRAME RELAY CONFIGURATION WITH
DIFFERING ACCESS LINE SPEEDS

A fully-meshed Frame Relay network of four
routers running IPX EIGRP process ID 456,
configured as a multipoint network

17
Contd..

Routers A-D
interface Serial 0
encapsulation frame-relay
!--- To enable Frame Relay encapsulation on this
interface.
bandwidth 56
!--- To set the bandwidth value for this interface

18
a point-to-point subinterface
19
Contd..

Configuration for A-C
Router A-C
interface Serial 0
encapsulation frame-relay
!--- To enable Frame Relay encapsulation on this
interface.
interface Serial 0.1 multipoint
!--- The subinterface is configured to function
as a point-to-point link using this command.
bandwidth 238
!--- To set the bandwidth value for this
interface.
interface Serial 0.2 point-to-point
bandwidth 18
description PVC to Router D
Router D's configuration
Router D
interface Serial 0
encapsulation frame-relay
!--- To enable Frame Relay encapsulation on this
interface.
interface Serial 0.1 point-to-point
bandwidth 18

20
CONTD

description PVC to Router A
interface Serial 0.2 point-to-point
!--- The subinterface is configured to function
as a point-to-point link
!--- using this command.
bandwidth 18
description PVC to Router B
interface Serial 0.3 point-to-point
bandwidth 18
description PVC to Router C
Router A-C
interface Serial 0.1 multipoint
!--- The subinterface is treated as a multipoint
link.
bandwidth 256
!--- To set the bandwidth value for this
interface.

21
Contd..

ipx bandwidth-percent eigrp 456 46
!--- To configure the percentage of bandwidth
that may be used by
!--- EIGRP on this interface.
interface Serial 0.2 point-to-point
!--- The subinterface is configured to function
as a point-to-point link
!--- using this command.
bandwidth 56
description PVC to Router D
ipx bandwidth-percent eigrp 456 16

22
STEP 2 CONFIGURING THE FRAME RELAY SWITCH

Use 4th Cisco router with 3 serial interfaces.(as
a frame relay switch and cable the routers) .
Paste the following configuration into the router
(depending on which equipment you have, the
interface numbers may be different).
!
hostname FRS
!
frame-relay switching
!
interface Serial0/0/0
description FR to HQ
encapsulation frame-relay
clock rate 128000
frame-relay lmi-type cisco
frame-relay intf-type dce

23
Contd..

frame-relay route 102 interface Serial0/0/1
201
frame-relay route 103 interface Serial0/1/0
301
no shutdown
!
interface Serial0/0/1
description FR to East
no ip address
encapsulation frame-relay
clock rate 64000
frame-relay lmi-type cisco
frame-relay intf-type dce
frame-relay route 201 interface Serial0/0/0
102
no shutdown
!

24
CONTD

interface Serial0/1/0
description FR to West
no ip address
encapsulation frame-relay
clock rate 64000
frame-relay lmi-type cisco
frame-relay intf-type dce
frame-relay route 301 interface Serial0/0/0
103
no shutdown
! End

25
STEP 3 CONFIGURING THE FRAME RELAY ENDPOINTS

Frame Relay(HQ), Spokes (East and West).
Check the topology diagram for the data-link
connection identifiers (DLCIs).
Off Turn Frame Relay Inverse Address Resolution
Protocol (InARP).
Configure all Frame Relay interfaces as physical
interfaces.
Inverse ARP allows a Frame Relay network to
discover the IP address associated with the
virtual circuit
A desirable trait in a production network.
Turn Inverse ARP off to limit the number of
dynamic DLCIs that are created.

26
CONTD

Its work in these pahses-
For a global configuration mode enter the
configuration menu for that assign it an IP
address with the help of ip address command.
fourth octet of the IP address is the router
number (HQ1, East2, West3
Assign the Frame Relay subnet to be 172.16.124.0
/29.
Enable Frame Relay encapsulation using the
interface configuration command encapsulation
frame-relay.
Disable Frame Relay Inverse ARP with the no
frame-relay inverse-arp command.

27
CONTD.

Map the other IPs in the subnet to DLCIs, using
the frame-relay map ip address dlci broadcast
command
HQ conf t
HQ(config) interface serial 0/0/1
HQ(config-if) ip address 172.16.124.1
255.255.255.248
HQ(config-if) encapsulation frame-relay
HQ(config-if) no frame-relay inverse-arp
East conf t
East(config) interface serial 0/0/1
East(config-if) ip address 172.16.124.2
255.255.255.248 East(config-if) encapsulation
frame-relay
East(config-if) no frame-relay inverse-arp

28
Contd..

East(config-if) frame-relay map ip 172.16.124.1
201 broadcast
East(config-if) frame-relay map ip 172.16.124.3
201 broadcast
East(config-if) no shutdown
West conft
West(config) interface serial 0/0/0
West(config-if) ip address 172.16.124.3
255.255.255.248
West(config-if) no frame-relay inverse-arp
West(config-if) encapsulation frame-relay
West(config-if) frame-relay map ip 172.16.124.1
301 broadcast
West(config-if) frame-relay map ip 172.16.124.2
301 broadcast
West(config-if) clock rate 64000
West(config-if) no shutdown

29
Contd..

Each frame relay end points check the
connectivity across the frame Relay network by
the pinging the remote routers.
For more information about this behavior of Frame
Relay, see the following FAQ page
http//www.cisco.com/warp/public/116/fr_faq.pdf

30
STEP 4 SETTING INTERFACE-LEVEL BANDWIDTH

Set the Frame Relay serial interface bandwidth
with the interface-level command bandwidth
bandwidth, specifying the bandwidth in kilobits
per second. For HQ, use 128 kbps. On East and
West, use 64 kbps
by default, EIGRP limits its bandwidth usage to
50 percent of the value specified by the
bandwidth parameter.
Each neighbor for which this is an outbound
interface has a traffic limit of a fraction of
that 50 percent, represented by 1/N, where N is
the number of neighbors out that interface
HQ(config) interface serial 0/0/1
HQ(config-if) bandwidth 128
East(config) interface serial 0/0/1
East(config-if) bandwidth 64
West(config) interface serial 0/0/0
West(config-if) bandwidth 64

31
CONTD

How much bandwidth on Serial 0/0/1 on HQ is
reserved for EIGRP traffic to East?
On HQ, up to 32 Kbps of bandwidth can be utilized
for EIGRP traffic to East. This represents one
fourth of the total bandwidth of that interface
Control both the bandwidth parameter and the
EIGRP bandwidth percentage on a per-interface
On HQ, limit the bandwidth used by EIGRP to 40
percent without changing the bandwidth parameter
on the interface.
The interface-level command ip bandwidth-percent
eigrp as_number percent
HQ(config-if) ip bandwidth-percent eigrp 1
40

32
STEP 5 CONFIGURING EIGRP

Use the global configuration mode command router
eigrp as_number
Represented discontiguous network (10.0.0.0/8)
configured on all routers.
HQ sends and receives summaries for 10.0.0.0/8
from both East and West
Auto summarization provokes considerable routing
disruptions in the network and turn off
auto-summarization on each router.
two major networks using here are network
10.0.0.0 for the loopbacks, and network
172.16.0.0 for the Frame Relay cloud.
Perform this configuration on all three routers
HQ(config) router eigrp 1
HQ(config-router) network 10.0.0.0

33
Contd..

HQ(config-router) network 172.16.0.0
HQ(config-router) no auto-summary Same for East
and West
Issue the show ip eigrp topology command on East
East show ip eigrp topology
IP-EIGRP Topology Table for AS(1)/ID(172.16.124.
2)
Codes P - Passive, A - Active, U - Update, Q -
Query, R - Reply,
r - reply Status, s - sia Status
P 10.2.0.0/19, 1 successors, FD is 128256
via Connected, Loopback1
P 10.1.0.0/19, 1 successors, FD is 40640000
via 172.16.124.1 (40640000/128256),
Serial0/0/1
P 10.2.32.0/19, 1 successors, FD is 128256
via Connected, Loopback33
P 10.1.32.0/19, 1 successors, FD is 40640000
via 172.16.124.1 (40640000/128256),
Serial0/0/1

34
CONTD

P 10.2.64.0/19, 1 successors, FD is 128256
via Connected, Loopback65
P 10.1.64.0/19, 1 successors, FD is 40640000
via 172.16.124.1 (40640000/128256),
Serial0/0/1
P 10.2.96.0/19, 1 successors, FD is 128256
via Connected, Loopback97
P 10.1.96.0/19, 1 successors, FD is 40640000
via 172.16.124.1 (40640000/128256),
Serial0/0/1
P 10.2.128.0/19, 1 successors, FD is 128256
via Connected, Loopback129
P 10.1.128.0/19, 1 successors, FD is 40640000
via 172.16.124.1 (40640000/128256),
Serial0/0/1
P 10.2.160.0/19, 1 successors, FD is 128256
via Connected, Loopback161

35
Contd..

P 10.1.160.0/19, 1 successors, FD is 40640000
via 172.16.124.1 (40640000/128256), Serial0/0/1
P 172.16.124.0/29, 1 successors, FD is 40512000
via Connected, Serial0/0/1
East
Which networks are missing from the topology
database?
All of the subnets in the 10.3.0.0/16 range are
missing from Easts topology table. These are the
remote loopback interfaces on the West router.
What do you suspect as being responsible for this
problem?
This problem is caused by the split horizon
functionality on R1. R1 will not send route
updates from East to West because the incoming
interface and outgoing interface are the same.

36
Contd..

Router 1 needs the no ip split-horizon eigrp
as_number command on its serial Frame Relay
interface
This command disables split horizon for an EIGRP
autonomous system
If split horizon is enabled (the default), route
advertisements from East to HQ do not travel to
West and vice versa,
Example
HQ(config) interface serial 0/0/1
HQ(config-if) no ip split-horizon eigrp 1

37
Contd..

Verify the correct EIGRP adjacencies with the
show ip eigrp neighbors command
HQ show ip eigrp neighbors
IP-EIGRP neighbors for process 1
H Address Interface Hold Uptime SRTT RTO
Q Seq
(sec) (ms) Cnt Num
1 172.16.124.2 Se0/0/1 176 000005 1588
5000 0 6
0 172.16.124.3 Se0/0/1 176 000005
23 1140 0 6
East show ip eigrp neighbors
IP-EIGRP neighbors for process 1
H Address Interface Hold Uptime SRTT RTO
Q Seq
(sec) (ms) Cnt Num
0 172.16.124.1 Se0/0/1 129 000052
20 2280 0 20
West show ip eigrp neighbors
IP-EIGRP neighbors for process 1
H Address Interface Hold Uptime SRTT
RTO Q Seq (sec) (ms) Cnt Num
0 172.16.124.1 Se0/0/0 176 000055
20 2280 0 13

38
IP route Command

show ip route command through Verify IP routes-
Example-
HQ show ip route
ltoutput omittedgt
172.16.0.0/29 is subnetted, 1 subnets
C 172.16.124.0 is directly connected,
Serial0/0/1
10.0.0.0/19 is subnetted, 18 subnets
D 10.2.0.0 90/20640000 via 172.16.124.2,
000436, Serial0/0/1
D 10.3.0.0 90/20640000 via 172.16.124.3,
000420, Serial0/0/1
C 10.1.0.0 is directly connected, Loopback1
D 10.2.32.0 90/20640000 via 172.16.124.2,
000436, Serial0/0/1
D 10.3.32.0 90/20640000 via 172.16.124.3,
000420, Serial0/0/1
C 10.1.32.0 is directly connected, Loopback33
D 10.2.64.0 90/20640000 via 172.16.124.2,
000437, Serial0/0/1
D 10.3.64.0 90/20640000 via 172.16.124.3,
000421, Serial0/0/1

39
Contd..

C 10.1.64.0 is directly connected, Loopback65
D 10.2.96.0 90/20640000 via 172.16.124.2,
000437, Serial0/0/1
D 10.3.96.0 90/20640000 via 172.16.124.3,
000421, Serial0/0/1
C 10.1.96.0 is directly connected, Loopback97
D 10.2.128.0 90/20640000 via 172.16.124.2,
000437, Serial0/0/1
D 10.3.128.0 90/20640000 via 172.16.124.3,
000421, Serial0/0/1
C 10.1.128.0 is directly connected, Loopback129
D 10.2.160.0 90/20640000 via 172.16.124.2,
000437, Serial0/0/1
D 10.3.160.0 90/20640000 via 172.16.124.3,
000421, Serial0/0/1
C 10.1.160.0 is directly connected, Loopback161
Same as another Two (EAST and WEST) ip route.

40
TCL Scripts

Run the following TCL script on all routers to
verify full connectivity
for each address
10.1.1.1
10.1.33.1
10.1.65.1
10.1.97.1
10.1.129.1
10.1.161.1
172.16.124.1
10.2.1.1
10.2.33.1
10.2.65.1
10.2.97.1
10.2.129.1
10.2.161.1
( continue)

41
Contd..

172.16.124.2
10.3.1.1
10.3.33.1
10.3.65.1
10.3.97.1
10.3.129.1
10.3.161.1
172.16.124.3
ping address
If anybody never used TCL scripts or need a
refresher, see the TCL lab in the routing module.

42
STEP 6 USING NON-BROADCAST EIGRP MODE

EIGRP use as default mode, which multicasts
packets to the link-local address 224.0.0.10
All Frame relay not support mulitcast.
EIGRP supports unicasts to remote destinations
using non broadcast mode on a per-interface basis
mode is analogous to configuring RIPv2 with a
passive interface and statically configuring
neighbors out that interface
To implement this functionality, do the
following
HQ(config) router eigrp 1
HQ(config-router) neighbor 172.16.124.2
serial 0/0/1
HQ(config-router) neighbor 172.16.124.3 serial
0/0/1
East(config) router eigrp 1
East(config-router) neighbor 172.16.124.1
serial 0/0/1
West(config) router eigrp 1
West(config-router) neighbor 172.16.124.1
serial 0/0/0

43
CONTD

HQ now has two neighbor statements, and the other
two routers have one. Once you configure neighbor
statements for a given interface, EIGRP
automatically stops multicasting packets out that
interface and starts unicasting packets instead.
verify that all your changes have worked with the
show ip eigrp neighbors command
HQ show ip eigrp neighbors
IP-EIGRP neighbors for process 1
H Address Interface Hold Uptime SRTT RTO Q
Seq
(sec) (ms) Cnt Num
1 172.16.124.2 Se0/0/1 153 000028 65
390 0 9
0 172.16.124.3 Se0/0/1 158 000028 1295
5000 0 9

44
Ip eigrp neighbours

East show ip eigrp neighbors
IP-EIGRP neighbors for process 1
H Address Interface Hold Uptime SRTT RTO
Q Seq
(sec) (ms) Cnt Num
0 172.16.124.1 Se0/0/1 146 000219 93
558 0 15
West show ip eigrp neighbors
IP-EIGRP neighbors for process 1
H Address Interface Hold Uptime SRTT
RTO Q Seq
(sec) (ms) Cnt Num
0 172.16.124.1 Se0/0/0 160
000300 59 354 0 15

45
STEP 7 IMPLEMENTING EIGRP MANUAL SUMMARIZATION

Implement EIGRP manual summarization on each of
the routers.
Each router should advertise only one network
summarization.
What is the length of the network mask that is
used to summarize all the loopbacks on each
router?
Summarize all the loopbacks at the 24-bit
boundary for each router.
Simplified EIGRP topology table on each router
using the show ip eigrp topology command
HQ show ip eigrp topology
IP-EIGRP Topology Table for AS(1)/ID(10.1.12.1)
Codes P - Passive, A - Active, U - Update, Q -
Query, R Reply, r - reply Status, s - sia
Status
P 10.2.0.0/16, 1 successors, FD is 2297856
via 172.16.124.2 (2297856/128256), Serial0/0/1
P 10.3.0.0/16, 1 successors, FD is 2297856

46
CONTD

via 172.16.124.3 (2297856/128256),
Serial0/0/1
P 10.1.0.0/16, 1 successors, FD is 128256
via Summary (128256/0), Null0
P 10.1.0.0/19, 1 successors, FD is 128256
East show ip eigrp topology
IP-EIGRP Topology Table for AS(1)/ID(10.2.161.1)
Codes P - Passive, A - Active, U - Update, Q -
Query, R Reply, r - reply Status, s - sia
Status
P 10.2.0.0/16, 1 successors, FD is 128256
via Summary (128256/0), Null0
P 10.2.0.0/19, 1 successors, FD is 128256
via Connected, Loopback1
P 10.3.0.0/16, 1 successors, FD is 2809856
via 172.16.124.1 (2809856/2297856),
Serial0/0/1
P 10.1.0.0/16, 1 successors, FD is 2297856
via 172.16.124.1 (2297856/128256), Serial0/0/1

47
West show ip eigrp topology

IP-EIGRP Topology Table for AS(1)/ID(172.16.124.3)
Codes P - Passive, A - Active, U -
Update, Q - Query, R Reply, r - reply Status, s
- sia Status
P 10.2.0.0/16, 1 successors, FD is 2809856
via 172.16.124.1 (2809856/2297856),
Serial0/0/0
P 10.3.0.0/16, 1 successors, FD is 128256
via Summary (128256/0), Null0
P 10.3.0.0/19, 1 successors, FD is 128256
via Connected, Loopback1
P 10.1.0.0/16, 1 successors, FD is 2297856
via 172.16.124.1 (2297856/128256), Serial0/0/0
P 10.3.32.0/19, 1 successors, FD is 128256