OSPF Commands

Vendor	LSA1	LSA2	LSA5	NAPALM support
Cisco	show ip ospf database router	show ip ospf database network	show ip ospf database external	YES
Quagga	show ip ospf database router	show ip ospf database network	show ip ospf database external	YES
Juniper	show ospf database router extensive | no-more	show ospf database network extensive | no-more	show ospf database external extensive | no-more	YES
Bird	show ospf state all	show ospf state all	show ospf state all	NO
Nokia	show router ospf database type router detail	show router ospf database type network detail	show router ospf database type external detail	YES
Mikrotik	/routing ospf lsa print detail file=lsa.txt	/routing ospf lsa print detail file=lsa.txt	/routing ospf lsa print detail file=lsa.txt	No
Huawei	display ospf lsdb router	display ospf lsdb network	display ospf lsdb ase	No
Paloalto	show routing protocol ospf dumplsdb	show routing protocol ospf dumplsdb	show routing protocol ospf dumplsdb	No
HP	show ip ospf link-state detail (Stub subnets without mask!)	show ip ospf link-state detail	show ip ospf external-link-state(LSA5 subnets without mask!)	No
Ubiquiti	show ip ospf database router	show ip ospf database network	show ip ospf database external	No
Allied Telesis	show ip ospf database router	show ip ospf database network	show ip ospf database external	No
Extreme	show ospf lsdb detail lstype router	show ospf lsdb detail lstype network	show ospf lsdb detail lstype as-external	No
Ericsson	show ospf database router detail	show ospf database network detail	show ospf database external detail	No
Mandatory	YES	YES	NO

Save the output from min two OSPF commands (for getting LSA1 and LSA2 ) or single IS-IS command and upload it to Topolograph with .txt or .log extenstion.

IS-IS Commands

Vendor	Command	Stub network included	External (redistributed) network
Cisco	show isis database detail	YES	No, (need tested LSDB for adding it)
Juniper	show isis database extensive	YES, but need tested LSDB for checking it	No, (need tested LSDB for adding it)
Nokia	show router isis database detail	YES, but need tested LSDB for checking it	No, (need tested LSDB for adding it)
Huawei	display isis lsdb verbose	YES, but need tested LSDB for checking it	No, (need tested LSDB for adding it)

GeneralView

Demo network has already uploaded for everyone. Press `Load dynamic graph` in order to upload it. Once you did it - you can see the topology, bold lines show ECMP links.

Press on bold line in order to unflat ECMP and see all nested links.

The shortest path. How to build.

It's possible to build the shortest path from a node. Just right click on a node. The description with all nodes and path cost is available above the topology.

Once you set the source and destination - you get colored the shortest path.

All the shortest paths to all nodes. Minimum Shortest Tree.

New feature of v2.11 release. MST allows see all the shortest paths To or From node. Just activate it from this radio-checkbox.

New feature of v2.11 release. All incoming the shortest paths are built to the node.

New feature of v2.11 release. All outgoing the shortest paths are built from the node.

New feature of v2.13 release. Difference between incoming and outgoing the shortest paths of selected node.

Network's termination device search

How is it possible to know what networks are terminated on some particular node. Thera are two ways how to know about it. The first one - start typing Node ID in Focus/From field and you will see all terminated networks on the node.

The second method is just to press on a node. New form pops up with a list of all backuped and non-backuped networks. The network is trated as backuped if such network is terminated on min two nodes.

Backup paths. Link outage emulation.

In order to find out the backup path - just press on colored edge. You will simulate a link outage and the shortest path will be rebuilt passing by a 'failed" edge.

Shortest path rebuilding by changing ospf cost on the fly

It's possible to change OSPF cost of any link. Right click on edge, new form pops up. Write new ospf cost in input field. Imagine if we need to redirect a traffic flow from 123.10.10.10 - 123.30.30.30 link to another link.

Right click on colored edge and set 12. We get new traffic flow with new OSPF cost.

Compare state of your network in different time

When you perform some configuration changes (add new network, redistribute another protocol to OSPF or change filters in existed route-maps) it is highly desire to make sure that results of you action give you expected changes in OSPF network. In order to do this - upload your network before your changes and right after it and compare them. What will be shown:

• New/old nodes
• New/old networks
• Links with new/old ospf cost

NetworkReactionOnFailure

In this mode it's possible to simulate a link or router shutdown/outage. The topology will be re-pained with expected changed traffic flow avoiding failed link or router.

Network reaction if a link/s goes down. Simulate link down.

Upload a graph if did't do it before and press on NetworkReactionOnFailure.

• Blue lines show traffic increasing over the link
• Grey lines show traffic decreasing over the link

As you can see decreasing rate of traffic from 123.30.30.30 node to 123.123.30.30 and 123.123.31.31 differ from opposite direction [ from 123.123.30.30 to 123.30.30.30 ] upto ~2times. It happens because of the unsymmetric traffic path.

We also can see an expected increasing rate of blue painted edge.

Network reaction if a link/s goes down on shared media.

Topolograph builds a topology based on OSPF adjacency and physical connectivity is hidden. But in some cases, we can assume that neighbors share the same media, in some cases - not. For example, if neighbors have a common DR - we assume that they are connected via shared physical media and then we emulate one of the edge failures between such neighbors - we emulate all edges down.

Mark all shared media links (which have common DR) as enabled

Network reaction if a link/s goes down on dedicated media.

If neighbors do not have DR or they have, but they are only two neighbors on the link, and when we emulate edge failure - we remove the only a single link between two particular neighbors.

Mark all shared media links (which have common DR) as disabled

Network reaction if a network devices goes down. Simulate device down.

Right click on a node and choose `shutdown this node`. The algorithm escape this node.

The network reaction on 123.123.101.101 node outage.

Network reaction on OSPF link cost changes.

Under NetworkReactionOnFailure tab it is possible to see a network reaction on a OSPF cost change on the fly. Set new OSPF cost in righted-clicked edge menu.

Analytics

In this mode it's possible to run algorithms in order to check your OSPF network.

Unidirectional and asymmetric links.

Print out any Unidirectional links ( number of IN and OUT links between two neighbors is not equal)

The edge is marked as red edge because of cost 1 and cost 10 OSPF metric

Asymmetric paths.

Print out any asymmetric paths from different points of views.

We get a list of nodes which have asymmetric paths. Just checking them - we can see difference in incoming and Outgoing paths.

Main and backup paths via the same ECMP.

We suggest that if we have multiple links bounded to ECMP and if the main link in ECMP goes down, the backup path should go via the second link in ECMP.

Passed report

If backup path goes not via ECMP and chooses completely different path - the report will be treated as failed.

Failed report

Backup paths via 3d party locations.

This report checks that if two locations are directly connected, backup paths should be only between two locations and do not go via third location as transit. Before running this report - it's needed to create groups (~site names/locations) and assign devices to groups. For example, there are two locations in France: the main site (EU_FRA) and the remote site (EU_FRA1). The same schema with offices in Italy. The main offices in France and Italy are connected to each other and have main (OSPF cost 10) and backup (OSPF cost 20) link.

Remote offices have the main link (OSPF cost 1) to their main offices and backup link (OSPF cost 10) to the foreign office.

If the main link between main offices goes down - the backup path goes via remote offices!

Failed report

Network heatmap

Under Analytics tab it is possible to see how many terminated subnets are backuped via terminating the same subnet on different devices.

Click on a node in order to find out which networks are backuped which not.

As we can see only own device's loopback is not backuped - it is normal.

API

It's time not to depends on NAPALM support of the vendor. You are free to choose your favorite NetDevOps tool like Ansible, netmiko, Nornir, etc, and upload your OSPF network graph to Topolograph via a POST request. Once you uploaded the graph - you get the difference with previously uploaded graphs, specifically, you will receive: new/old OSPF adjacencies (edges on the graph) new/old devices in OSPF topology number of backuped and non backuped subnets in the topology

Get credentials.

It's needed to create an account with email/password on Login/Registration page as well as add your source IP/Network to authorised source network list under API tab.

Upload OSPF topology via API

Save the output from commands describing OSPF LSA1, LSA2, LSA2 and save it in the single file - cisco_lsdb_output.txt

      import requests
      from pprint import pprint as pp
      with open('cisco_lsdb_output.txt') as f:
        lsdb_output = f.read()
        r_post = requests.post('https://topolograph.com/api/graph', auth=('youraccount@domain.com', 'your-pass'), 
                                json={'lsdb_output': lsdb_output, 'vendor_device': 'Cisco'})
        pp(r_post.json())
      

Using python we read the content of the file and push it (it's better to say - POST it) to the topolograph.

The output returns:

diff with previously uploaded graphs

link to get all networks

status about passed checks

        >>> pp(r_post.json())
        {'diff': {'compared_with_graph_time': '02Jun2021_21h18m04s_13_hosts',
                  'graphs_diff': {'all_edges_stats_ll': [{'dst_node': '123.123.110.110',
                                                          'link_cost': 10,
                                                          'link_status': 'old',
                                                          'src_node': '123.123.100.100'},
                                                         {'dst_node': '123.123.111.111',
                                                          'link_cost': 10,
                                                          'link_status': 'old',
                                                          'src_node': '123.123.101.101'},
                                                         {'dst_node': '123.123.100.100',
                                                          'link_cost': 10,
                                                          'link_status': 'old',
                                                          'src_node': '123.123.110.110'},
                                                         {'dst_node': '123.123.101.101',
                                                          'link_cost': 10,
                                                          'link_status': 'old',
                                                          'src_node': '123.123.111.111'}],
                                  'new_nodes': [],
                                  'old_nodes': []},
                  'networks_diff': {'new_subnets_attr_dd_ll': [{'rid': '123.30.30.30',
                                                                'subnet': '30.30.30.30/32'}],
                                    'old_subnets_attr_dd_ll': [{'rid': '123.10.10.10',
                                                                'subnet': '1.2.3.0/30'}]}},
        'graph_time': '08Jun2021_20h15m26s_13_hosts',
        'hosts': {'count': 12},
        'networks': {'backuped': 14,
                      'count': 38,
                      'notbackuped': 24,
                      'url_link': 'https://topolograph.com/api/network/08Jun2021_20h15m26s_13_hosts'},
        'reports': {'asym_edges_pass_status': False},
        'timestamp': '2021-06-8T20:15:26.265000'}
      

Visual difference between OSPF states.

Groups & VRF

Multiple OSPF routing instances can exist on a single device in several VRFs. It causes nodes duplication on a visualisation graph. VRF tab allows to point multiple OSPF instances to a single one and avoid node duplication on a graph.

There are three VRFs and three OSPF instances on a router. In order to avoid node duplication - create VRFs (or import them via CSV), associate the node with VRF and point duplicated instances to master OSPF RID. the node with VRF and point duplicated instances to master OSPF RID.